Bug 1032039 - JON server cannot restart itself

The fix implements DiscoveryCallback and ResourceUpgradeCallback in
rhq-server plugin and sets proper start script parameters (uses rhqctl) for
RHQ Server resources.

When non-HA server is restarted via RHQ Server scheduled operation (agent
attempting to restart the server is also reporting to the same server)
restart operation will not succeed (although server was in fact restarted)
and it will timeout - this happens, because when agent wants to deliver
operation result to server, server goes immediatelly down (as a consequence
of restart operation) and when it comes up, agent is unable to resend
operation result data anymore (this maybe a separate bug/edge case)