Add Audit Scope Handler

This patch set adds audit scope mechanism.
It also removes host_aggregate field.

Change-Id: Ia98ed180a93fc8c19599735e2b41471d322bae9a
Partially-Implements: blueprint define-the-audit-scope

watcher/db/api.py

@@ -250,7 +250,6 @@ class BaseConnection(object):
                          'uuid': utils.generate_uuid(),
                          'name': 'example',
                          'description': 'free text description'
-                         'host_aggregate': 'nova aggregate name or id'
                          'goal': 'DUMMY'
                          'extra': {'automatic': True}
                         }

watcher/db/sqlalchemy/api.py

@@ -309,8 +309,7 @@ class Connection(api.BaseConnection):
         if filters is None:
             filters = {}
 
-        plain_fields = ['uuid', 'name', 'host_aggregate',
-                        'goal_id', 'strategy_id']
+        plain_fields = ['uuid', 'name', 'goal_id', 'strategy_id']
         join_fieldmap = JoinMap(
             goal_uuid=NaturalJoinFilter(
                 join_fieldname="uuid", join_model=models.Goal),

watcher/db/sqlalchemy/models.py

@@ -157,11 +157,11 @@ class AuditTemplate(Base):
     uuid = Column(String(36))
     name = Column(String(63), nullable=True)
     description = Column(String(255), nullable=True)
-    host_aggregate = Column(Integer, nullable=True)
     goal_id = Column(Integer, ForeignKey('goals.id'), nullable=False)
     strategy_id = Column(Integer, ForeignKey('strategies.id'), nullable=True)
     extra = Column(JSONEncodedDict)
     version = Column(String(15), nullable=True)
+    scope = Column(JSONEncodedList)
 
 
 class Audit(Base):
@@ -179,9 +179,9 @@ class Audit(Base):
     deadline = Column(DateTime, nullable=True)
     parameters = Column(JSONEncodedDict, nullable=True)
     interval = Column(Integer, nullable=True)
-    host_aggregate = Column(Integer, nullable=True)
     goal_id = Column(Integer, ForeignKey('goals.id'), nullable=False)
     strategy_id = Column(Integer, ForeignKey('strategies.id'), nullable=True)
+    scope = Column(JSONEncodedList, nullable=True)
 
 
 class Action(Base):