Use Tags when CanaryTags isn't specified

fix typo: 'ode' to 'node'.

This PR fixes a bug where we weren't defaulting to `tags` when
`canary_tags` was empty and adds documentation.

Fix RPC tunneling when running both client/server

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