[Hawkular-dev] agent PR needs peer-review

Here's another agent PR that needs peer-review and merging. PR: https://github.com/hawkular/hawkular-agent/pull/150 JIRA: https://issues.jboss.org/browse/HWKAGENT-57 The issue here is that when the agent is told to shutdown by the WildFly container controller, the agent should set availability metrics to DOWN for local resources. So in the shutdown code of the agent service, it now gets a list of all configured avail metrics that need to be set to DOWN and sets them, making sure WF doesn't completely shutdown until those metrics are set (needed to do some changes around async storage to the metrics REST API - had to add a wait period just so the stop() method doesn't return until after the metrics are set - otherwise, WF will shutdown potentially before all the REST calls are made). Anyway, this doesn't fully solve the issue because there are cases when the agent's WF container dies abruptly (i.e. crashes). That's next on my todo - see https://issues.jboss.org/browse/HAWKULAR-407