Removed unused 'alarm' field

The 'alarm' field is currently unused, so it has been removed.

Change-Id: I02fa15b06ed49dbc5dd63de54a9cde601413983c
Closes-Bug: #1550261

watcher/db/sqlalchemy/api.py

@@ -281,8 +281,6 @@ class Connection(api.BaseConnection):
 
         if 'state' in filters:
             query = query.filter_by(state=filters['state'])
-        if 'alarm' in filters:
-            query = query.filter_by(alarm=filters['alarm'])
 
         query = self.__add_soft_delete_mixin_filters(
             query, filters, models.Action)

watcher/db/sqlalchemy/models.py

@@ -161,8 +161,6 @@ class Action(Base):
     action_type = Column(String(255), nullable=False)
     input_parameters = Column(JSONEncodedDict, nullable=True)
     state = Column(String(20), nullable=True)
-    # todo(jed) remove parameter alarm
-    alarm = Column(String(36))
     next = Column(String(36), nullable=True)