Tense consistency - use SUCCEEDED instead of SUCCESS

[Vincent Françoise]

Both audits and action plans have different states corresponding to their respective life cycle.
The problem is that the SUCCESS state is the only state written using the present tense.

So the objective is to make it more consistent with the rest of states by renaming it to SUCCEEDED.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/250924

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/250924
Committed: https://git.openstack.org/cgit/openstack/watcher/commit/?id=6e1e445e557998208d63fae07f98dea09996a143
Submitter: Jenkins
Branch: master

commit 6e1e445e557998208d63fae07f98dea09996a143
Author: Gábor Antal <email address hidden>
Date: Fri Nov 27 18:53:34 2015 +0100

    Fixed tense consistency (used past) in statuses

    In several places in Watcher, there are statuses which corresponds
    to a status in the respective life cycle. There were used past tense
    everywhere, except "SUCCESS" which was written in present tense.

    So I searched for all the occurences of this state, and replaced them
    with their past tense form.

    Change-Id: Ic41def96d1a608da06a1e394e24704d4f06ab32a
    Closes-Bug: #1520276