Bug 1465945 - make retrigger an action with kind=hook; r=tomprince

MozReview-Commit-ID: LlZVweIjHsg

--HG--
extra : rebase_source : b0939194636847fd2056b533de2c21aef5290814

taskcluster/taskgraph/actions/retrigger.py

@@ -21,6 +21,8 @@ logger = logging.getLogger(__name__)
     title='Retrigger',
     name='retrigger',
     symbol='rt',
+    kind='hook',
+    generic=True,
     description=(
         'Create a clone of the task.\n\n'
     ),