Removed use of deprecated LOG.warn method

LOG.warn is deprecated. We were still used it some places.
So I replaced the LOG.warn method to LOG.warning, which is not
deprecated.

Change-Id: I9461cec569445ad6c40db9ce2feeeba1ef0af0e3
Closes-Bug: #1508442

watcher/common/messaging/messaging_handler.py

@@ -94,7 +94,7 @@ class MessagingHandler(threading.Thread):
                 )
                 self.__server = self.build_server(target)
             else:
-                LOG.warn(
+                LOG.warning(
                     _LW("No endpoint defined; can only publish events"))
         except Exception as e:
             LOG.exception(e)

watcher/common/utils.py

@@ -50,8 +50,9 @@ def safe_rstrip(value, chars=None):
 
     """
     if not isinstance(value, six.string_types):
-        LOG.warn(_LW("Failed to remove trailing character. Returning original "
-                     "object. Supplied object is not a string: %s,"), value)
+        LOG.warning(_LW(
+            "Failed to remove trailing character. Returning original object."
+            "Supplied object is not a string: %s,"), value)
         return value
 
     return value.rstrip(chars) or value

watcher/decision_engine/model/mapping.py

@@ -72,7 +72,7 @@ class Mapping(object):
                 # remove vm
                 self.mapping_vm.pop(vm_uuid)
             else:
-                LOG.warn(
+                LOG.warning(
                     "trying to delete the virtual machine {0}  but it was not "
                     "found on hypervisor {1}".format(
                         vm_uuid, node_uuid))