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

watcher/tests/api/v1/test_actions.py

@@ -467,7 +467,7 @@ class TestPatch(api_base.FunctionalTest):
         self.assertTrue(response.json['error_message'])
 
     def test_add_ok(self):
-        new_state = 'SUCCESS'
+        new_state = 'SUCCEEDED'
         response = self.patch_json(
             '/actions/%s' % self.action.uuid,
             [{'path': '/state', 'value': new_state, 'op': 'add'}])

watcher/tests/api/v1/test_audits.py

@@ -360,7 +360,7 @@ class TestPatch(api_base.FunctionalTest):
         self.assertTrue(response.json['error_message'])
 
     def test_add_ok(self):
-        new_state = 'SUCCESS'
+        new_state = 'SUCCEEDED'
         response = self.patch_json(
             '/audits/%s' % self.audit.uuid,
             [{'path': '/state', 'value': new_state, 'op': 'add'}])