This reverts commit 367b9376ec51008c2d85806d8a485fbd5f4fe951.

A fix for a race condition in an external call to pullUpdates which could result in NPE. There are still other race conditions, but not specific to pullUpdates() anymore
Backported by hand from 7c9d39be5b9e916719c98b1755454895b9e7943a

Backported by hand from 641787b446c9d6ba58ee0863301d9cdb1ab255ea

By hand backport of a72063cb67a48f8695405a644423c036dc21bcbf where ZK cluster is waited for even if a store is found during startup.

Conflicts:

	ha/src/main/java/org/neo4j/kernel/ha/zookeeper/ZooClient.java

48231898a76b0e0a915974aee844614df98cb5a7
665963f6d82b69337d532293c7d1cf93be00d154

Fix for a race condition between construction of the ZooKeeper instance, its watcher, and the first SyncConnected event (and potentially other events) which in extension could cause an HA db to not start
Backported by hand from bab1eccbde613a01a241a4f1e79d82d3e7c92bd0

Plugged a little memory leak and tries with a 3-instance global ZK cluster for testing instead of 1-instance (OSX seems to have problems)
Cherry-picked from 89802617b6a4a5f72caa9dec7c53bd4e97bc375f (only the actual fix)

Conflicts:

	ha/src/test/java/org/neo4j/ha/TestBackupToolHa.java

and possibility to restart it automatically).

Conflicts:

	ha/src/test/java/jmx/TestHaBean.java
	ha/src/test/java/org/neo4j/ha/TestBackupToolHa.java
	ha/src/test/java/org/neo4j/ha/TestClientThreadIsolation.java
	ha/src/test/java/org/neo4j/ha/TestPullUpdates.java
	ha/src/test/java/org/neo4j/kernel/ha/zookeeper/TestZooClient.java
	ha/src/test/java/org/neo4j/test/ha/LocalhostZooKeeperCluster.java
	ha/src/test/java/slavetest/AbstractHaTest.java
	ha/src/test/java/slavetest/SingleJvmTest.java
	ha/src/test/java/slavetest/SingleJvmWithNettyTest.java
	ha/src/test/java/slavetest/TestClusterNames.java

Conflicts:

	ha/src/test/java/org/neo4j/kernel/ha/zookeeper/TestZooClient.java
	ha/src/test/java/slavetest/AbstractHaTest.java

This reverts commit dc80fccf0635516da42f99301718d691d21706cf.

(cherry picked from commit 9289de854a83ef984e6be06d5ad8f7fe18ece8a0)

Conflicts:

	ha/src/main/java/org/neo4j/kernel/HighlyAvailableGraphDatabase.java

(cherry picked from commit 1d98ffe48ce6bc7905c51e0df34c1e2ae9636952)

Conflicts:

	ha/src/main/java/org/neo4j/kernel/BranchedStoreBean.java
	ha/src/main/java/org/neo4j/kernel/HighlyAvailableGraphDatabase.java
	ha/src/test/java/org/neo4j/ha/TestConfig.java

Moved GC resistent cache to enterprise and made cache implementations pluggable via Service loader

Logical log version is retrieved from the sandbox directory as it should.

Uses ability to reuse gcr caches between sessions for between internal restarts to reduce the strain on GC

Conflicts:

	backup/src/main/java/org/neo4j/backup/OnlineBackup.java

Conflicts:

	backup/src/test/java/org/neo4j/backup/TestBackup.java

Now full backup fetches and writes to disk the latest transaction if not present, allowing for an HA cluster to bootstrap itself

Conflicts:

	backup/src/main/java/org/neo4j/backup/OnlineBackup.java
	backup/src/test/java/org/neo4j/backup/TestBackup.java