Add HA support

This patch set adds hostname field to Audit and Action Plan
objects to track services which execute these objects.

Change-Id: I786e419952925c380c969b12cc60f9a1004af96b
Partially-Implements: blueprint support-watcher-ha-active-active-mode

watcher/objects/action_plan.py

@@ -106,7 +106,8 @@ class ActionPlan(base.WatcherPersistentObject, base.WatcherObject,
     # Version 1.2: audit_id is not nullable anymore
     # Version 2.0: Removed 'first_action_id' object field
     # Version 2.1: Changed global_efficacy type
-    VERSION = '2.1'
+    # Version 2.2: Added 'hostname' field
+    VERSION = '2.2'
 
     dbapi = db_api.get_instance()
 
@@ -117,6 +118,7 @@ class ActionPlan(base.WatcherPersistentObject, base.WatcherObject,
         'strategy_id': wfields.IntegerField(),
         'state': wfields.StringField(nullable=True),
         'global_efficacy': wfields.FlexibleListOfDictField(nullable=True),
+        'hostname': wfields.StringField(nullable=True),
 
         'audit': wfields.ObjectField('Audit', nullable=True),
         'strategy': wfields.ObjectField('Strategy', nullable=True),

watcher/objects/audit.py

@@ -87,7 +87,8 @@ class Audit(base.WatcherPersistentObject, base.WatcherObject,
     # Version 1.3: Added 'next_run_time' DateTime field,
     #              'interval' type has been changed from Integer to String
     # Version 1.4: Added 'name' string field
-    VERSION = '1.4'
+    # Version 1.5: Added 'hostname' field
+    VERSION = '1.5'
 
     dbapi = db_api.get_instance()
 
@@ -105,6 +106,7 @@ class Audit(base.WatcherPersistentObject, base.WatcherObject,
         'auto_trigger': wfields.BooleanField(),
         'next_run_time': wfields.DateTimeField(nullable=True,
                                                tzinfo_aware=False),
+        'hostname': wfields.StringField(nullable=True),
 
         'goal': wfields.ObjectField('Goal', nullable=True),
         'strategy': wfields.ObjectField('Strategy', nullable=True),