Goal:

Implement the upstream changes required to implement the feature:

The Watcher service should allow to exclude actions from an Action Plan execution in two situations:

• A cloud admin explicitly wants to exclude an action or set of actions from execution before starting an action plan.

• Watcher applier detects the object where the action is applied to be in a state where the action should not be applied. For example, in a migrate action,  the instance does not longer exist.

Acceptance Criteria:

• spec describing the feature is merged upstrem.
• Required patches to implement the feature are merged both to watcher, watcherclient and watcher-dashboard are merged upstream
• Tests in watcher-tempest-plugin are merged and running in upstream gates.