Bug 1411796 - [taskgraph] Skip parameters.rst doc verification if parameters.strict is False, r=dustin

This is needed to prevent parameter mismatch errors when using |mach try fuzzy|
from an older revision. This can happen if the parameters.yml is being
downloaded from a commit with a recently added parameter.

MozReview-Commit-ID: 4NxCM7i8B4W

--HG--
extra : rebase_source : 4d2052aae33292fbd7928a79bfedba76426206b9

taskcluster/taskgraph/generator.py

@@ -291,6 +291,9 @@ class TaskGraphGenerator(object):
         return self._run_results[name]
 
     def verify_parameters(self, parameters):
+        if not parameters.strict:
+            return
+
         parameters_dict = dict(**parameters)
         verify_docs(
             filename="parameters.rst",