Add provisioned memory to node info

Adds a separate field to the node memory, "provisioned", which totals
the amount of memory provisioned to all VMs on the node, regardless of
state, and in contrast to "allocated" which only counts running VMs.

Allows for the detection of potential overprovisioned states when
factoring in non-running VMs.

Includes the supporting code to get this data, since the original
implementation of VM memory selection was dependent on the VM being
running and getting this from libvirt. Now, if the VM is not active, it
gets this from the domain XML instead.

node-daemon/pvcnoded/VMInstance.py

@@ -33,6 +33,8 @@ import pvcnoded.common as common
 
 import pvcnoded.VMConsoleWatcherInstance as VMConsoleWatcherInstance
 
+import daemon_lib.common as daemon_common
+
 def flush_locks(zk_conn, logger, dom_uuid):
     logger.out('Flushing RBD locks for VM "{}"'.format(dom_uuid), state='i')
     # Get the list of RBD images
@@ -153,7 +155,11 @@ class VMInstance(object):
 
     def getmemory(self):
         try:
-            memory = int(self.dom.info()[2] / 1024)
+            if self.dom is not None:
+                memory = int(self.dom.info()[2] / 1024)
+            else:
+                domain_information = daemon_common.getInformationFromXML(self.zk_conn, self.domuuid)
+                memory = int(domain_information['memory'])
         except:
             memory = 0