Comment 2 for bug 1728527

Pacemaker is a cluster manager rather than monitoring software, so IIUC its (host) state was not really designed to be polled via this kind of "pull" model - instead its state machine was designed to "push" events and initiate actions via resource agents. Therefore long term I think we need to implement https://storyboard.openstack.org/#!/story/2002124 which replaces this hostmonitor with the nova-host-alerter OCF RA.