This patch adds feature to cancel action plan in watcher.
A General flow from watcher-api to watcher-applier is implemented.
action plan cancel can cancel any [ongoing, pending, recommended]
action plan, it will update the action states also to "cancelled".
For ongoing actions in action plan, actions needs to be aborted.
Seperate patches will be added to support abort operation
in each action.
Notification part is addressed by a seperate blueprint.
https://blueprints.launchpad.net/watcher/+spec/notifications-actionplan-cancel
Change-Id: I895a5eaca5239d5657702c8d1875b9ece21682dc
Partially-Implements: blueprint cancel-action-plan
New audit state SUSPENDED is added in this patch set. If audit
state with continuous mode is changed from ONGOING to SUSPENDED,
audit's job is removed and the audit is not executed.
If audit state changed from SUSPENDED to ONGOING in reverse,
audit is executed again periodically.
Change-Id: I32257f56a40c0352a7c24f3fb80ad95ec28dc614
Implements: blueprint suspended-audit-state
Check the creation time of the actionplan,
and set the state to SUPERSEDED if it has expired.
Change-Id: I900e8dc5011dec4cffd58913b9c5083a6131d70d
Implements: blueprint stale-action-plan
