Commit 07f87b2b replaced strings
 in some legacy database files that are used as resources for
 upgrade tests. That lead them to reporting wrong versions
 and not being processed properly. This commit simply restores
 them to their correct contents, by checking out the previous
 versions.

due to, most likely, a problem with the test or even SubProcess that the
piping of System.out/System.err from the sub process where those buffers
fill up in the sub process since the parent process doesn't pull that
data. When those buffers have filled up, then any write to its System.xxx
will block awaiting the buffer to drain, which it doesn't.

The current fix is just to not use System.out in this test, however a
future fix should be to look at and fix the issue in SubProcess itself.

Before it was a pending backport. Unfortunately, there appears to be
 some flakyness in the test, which points to a bug. Needs investigation.

There were two problems with HaBackupProvider, both on cluster
 joining. One was that it depended on snapshots to discover the
 state of the cluster, while since 1.9.6 this has changed and joining
 instances must as for elections. The other was that it passed in a null
 for a SnapshotFilter, which caused NPEs and did not let the availability
 messages to be processed. Both problems are now solved.

Also fixes some formatting in PCME

When an instance times out on phase 2, if it is closed or delivered
 it should have its payload retried. This patch adds this functionality.

Introduction of monitoring in the kernel and HA network operations 

Adds two tests that make use of TransactionMonitor to monitor transaction
 propagation in clusters. One test counts events by committing and pushing
 from both slaves and the master, while the other counts transactions
 pulled from slaves.

Introduces TransactionMonitor to facilitate measurement of transaction
 events, current commits and commit entry injections.
Adds support for that in XaResourceManager, tagged by datasource name.
Introduces a sample counting implementation meant for testing,
 EideticTransactionMonitor.
Introduces tests for basic functionality in kernel and lucene-index

TaggedMonitorListenerInvocationHandler was not getting the tags that
 it was created with. The result was that listeners added for specific tags
 would get called for all invocations of the observed interface regardless.
 This commit fixes the issue and adds a test for it.

ByteCounterMonitor is generic enough so it does not have to be
 in o.n.k.i.t.xaframework anymore

BlockLogBuffer now updates a ByterCounterMonitor with the bytes it
 writes to the underlying buffer. This way all operations that
 serialize transactions to the network can be monitored.
Master and Client instances now make use of that BlockLogBuffer
 for streaming results and transactions.
Introduces a RequestMonitor which logs HA requests. It supports
 request context via a hashmap which can be set to contain various
 information about the request logged.
Client and Server now update a RequestMonitor with requests sent
 and received, respectively.

LogExtractor now updates a ByteCounterMonitor with bytes read while
 extracting transaction entries from a log
XaLogicalLog updates a ByterCounterMonitor when deserializing
 prepared transactions from disk for sending over the network
XaLogicalLog now updates a ByteCounterMonitor when deserializing
 a transaction stream over the network

Ha protocols from versions 1.5.3 and 1.7 are no longer supported for
 rolling upgrades. Hence they are no longer necessary to be present
 in the codebase.

It is clear after some usage that log buffer monitoring is really
 a case of counting bytes, functionality that needs to be replicated in
 other places as well. It makes sense therefore to have LogBufferMonitor
 strictly count bytes, rename it to ByterCounterMonitor and reuse it
 where necessary.

Uses the Monitors functionality to add bytes written counting
 facilities to DirectMappedLogBuffer. Achieved via introducing
 a LogBufferMonitor interface that is used by DMLB.
XaLogicalLog and TxLog require access to Monitors to
 create the proper monitor and pass it to their DMLB.

There was only one implementation of LogBufferFactory which
 was a straightforward call to DMLB constructor. This did
 not call for the need for a factory abstraction and since
 it was complicating upcoming work on monitoring it has now
 been removed.

Removes the ComException wrapping of server-side BranchedDataException

Making the reporting of BiasedWinnerStrategy a bit easier to

o This is a 1.9 version - lots of classes moved around so I've
  submitted a 2.0 version as well
o Changed wording so it describes it in words that will be easier
for the field team to understand
o Added tests around the BiasedWinnerStrategy

which is no longer needed due to recent changes in exception streaming
from server to client. In fact the wrapping prevented a slave to properly
react to branched data and would make that slave unable to ever join the
cluster.

The test MonitorsTest.shouldUnregister() was failing with a ClassCastException.
 The reason was that it was doing the cast on a field different than the one that
 it was performing the instanceof check.

Conflicts:
	community/kernel/src/test/java/org/neo4j/kernel/monitoring/MonitorsTest.java

Don't stop neo data source in case of failure

when switching to slave, because it will prevent future switch tries with
NPE in CommonAbstractStore.

Fix for race between kernel panic and mode switching

where a thread switching role to slave and
HaKernelPanicHandler thread were competing to harden the master
delegate handler. While all components were switching to their slave
versions a kernel panic event came in and made its switch, ending with
hardening the master delegate handler. All components would take that
as a sign about the master delegate being ready to use. When the
slave switching was done, that thread would set the master delegate to
the actual one, but all components would have already gotten a concrete
reference to the master such that the latter setDelegate call would
not affect them.

Fix is to only have setDelegate() (not harden()) dereference the Concrete
instance so that a setDelegate() after harden() will override that
delegate, making it visible to the peers of it.

Fix for incorrect exception handling on request reading error in HA.

Moved stability changes from master into 1.9 for SubProcess.

 o Added test and implementation for better error handling on early request parsing failure.
 o Moved serialization of requests and deserialization of responses into Protocol class.
 o Added handling of BranchedDataException in HAMS.

 NOTE: If you are forward-merging this change into 2.0, you can throw
       away all the changes in this commit, they are already present
       in the master branch.

logs full vote list, filtered votes and biased instances for
promotion/demotion.

Monitoring was part of the o.n.k.impl.util package, now it is moved to o.n.k.monitoring
Monitors has support for tags added so finer grained control over listeners can be
 achieved
Monitors no longer accepts a logger as a constructor argument - that functionality
 can now be properly achieved by adding a Monitors.Monitor to the Monitors instance.