Remove direct access to dbapi
Remove direct access to dbapi

In line [1], we directly use the dbapi in order to
filter the actions by action_plan_id.

[1] https://github.com/openstack/watcher/blob/master/watcher/applier/default.py#L63

Change-Id: I2c75528f619a5277d46702cc3b4ca4bc7280f990
Closes-Bug: #1534170

openstack/watcher,stackforge/watcher,stackforge/watcher,openstack/watcher