Emit heartbeat and node registration events

Emit events when node eligibility is set

Emit Node Events for draining

change allocation ID used with nomad alloc logs command

Add nil check before setting timeout on docker client

Check allocation's desired state in GC eligibility logic

Add CLI and API support for forcing rescheduling of failed allocs 

Upgrade Nomad to Go 1.10.2

Add autocomplete to missing commands

changing allocation ID used with nomad alloc status command

Doc updates to clarify leave_on_terminate

Avoid splitting log line across two files

Add a warning not to share consul nodes

driver/docker: pull image with digest

set killmode/killsignal in systemd example

Fix a typo

docs: fix typo in json documentation