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/api/controllers/v1/action_plan.py

@@ -230,6 +230,9 @@ class ActionPlan(base.APIBase):
     links = wsme.wsattr([link.Link], readonly=True)
     """A list containing a self link and associated action links"""
 
+    hostname = wsme.wsattr(wtypes.text, mandatory=False)
+    """Hostname the actionplan is running on"""
+
     def __init__(self, **kwargs):
         super(ActionPlan, self).__init__()
         self.fields = []

watcher/api/controllers/v1/audit.py

@@ -77,6 +77,8 @@ class AuditPostType(wtypes.Base):
 
     auto_trigger = wtypes.wsattr(bool, mandatory=False)
 
+    hostname = wtypes.wsattr(wtypes.text, readonly=True, mandatory=False)
+
     def as_audit(self, context):
         audit_type_values = [val.value for val in objects.audit.AuditType]
         if self.audit_type not in audit_type_values:
@@ -305,6 +307,9 @@ class Audit(base.APIBase):
     next_run_time = wsme.wsattr(datetime.datetime, mandatory=False)
     """The next time audit launch"""
 
+    hostname = wsme.wsattr(wtypes.text, mandatory=False)
+    """Hostname the audit is running on"""
+
     def __init__(self, **kwargs):
         self.fields = []
         fields = list(objects.Audit.fields)