This patchset fixes the lack of field validation that are provided
by an API user.
Via a PATCH on /action_plans, the only field that can be modified
is now the 'state'. This field can only perform to the following
state transitions:
- RECOMMENDED --> TRIGGERED
- RECOMMENDED --> CANCELLED
- ONGOING --> CANCELLED
- TRIGGERED --> CANCELLED
The DELETED state can only be set using a DELETE request.
Closes-Bug: #1531106
Change-Id: I6669cbe63407f0bbb792fb2e2ce6b1e8a7365238
