This change consolidates loading services and checks from both config
and persisted state into methods on the agent. As part of this, we
introduce optional persistence when calling RemoveCheck/RemoveService.
Fixes a bug where config reloads would kill persisted services/checks.
Also fixes an edge case:
1. A service or check is registered via the HTTP API
2. A new service or check definition with the same ID is added to config
3. Config is reloaded
The desired behavior (which this implements) is:
1. All services and checks deregistered in memory
2. All services and checks in config are registered first
3. All persisted checks are restored using the same logic as the agent
start sequence, which prioritizes config over persisted, and removes
any persistence files if new config counterparts are present.
* In connection pool, there is no guarantee that .reap() cannot execute the same time as .Shutdown() is called. It also did not benefit to eval shutdown when a select is run on the shutdown channel.
* In server, same principle applies to handleConsulConn. Since we also have a shutdown channel, it makes more to use this than to loop on a bool variable.
After e6b6f181728b88c2e430fc7ad71fe1f84db3418c if consul was built
with just running "go build" the GitDescribe would be empty and consul
version would be empty.
This change alters the behaviour so that if consul is build without
proper ldflags the version will be postfixed with "dev" prerelease to
indicate that it is self compiled in a wrong way.
Should someone have a bug in such a binary at least devs should easily
see from the version number that binary has not been created by
recommended means.
Added a "delete" behavior for session invalidation, in addition to
the default "release" behavior. On session invalidation, the sessions
Behavior field is checked and if it is set to "delete", all nodes owned
by the session are deleted. If it is "release", then just the locks
are released as default.
