Separate monitoring and move to 60s interval

Removes the dependency of the monitoring subsystem from the node
keepalives, and runs them at a 60s interval to avoid excessive backups
if a plugin takes too long.

Adds its own logs and related items as required.

Finally adds a new required argument to the run() of plugins, the
coordinator state, which can be used by a plugin to determine actions
based on whether the node is a primary, secondary, or non-coordinator.

node-daemon/plugins/psql

@@ -57,9 +57,11 @@ class MonitoringPluginScript(MonitoringPlugin):
 
         pass
 
-    def run(self):
+    def run(self, coordinator_state=None):
         """
         run(): Perform the check actions and return a PluginResult object
+
+        The {coordinator_state} can be used to check if this is a "primary" coordinator, "secondary" coordinator, or "hypervisor" (non-coordinator)
         """
 
         # Run any imports first