Only report to gerrit if the action is from gerrit

When we have multiple sources in the same pipeline we can end up with a
pipeline trying to report to gerrit when the result came from a
different source. Only report to gerrit when the source came from
gerrit.

Change-Id: I26e92002517a86af0d5482fbc73c5dd5b308b363
Signed-off-by: Jamie Lennox <jamielennox@gmail.com>
Co-Authored-By: Tobias Henkel <tobias.henkel@bmw.de>
diff --git a/tests/fixtures/config/zuul-connections-multiple-gerrits/main.yaml b/tests/fixtures/config/zuul-connections-multiple-gerrits/main.yaml
index f5bff21..38810fd 100644
--- a/tests/fixtures/config/zuul-connections-multiple-gerrits/main.yaml
+++ b/tests/fixtures/config/zuul-connections-multiple-gerrits/main.yaml
@@ -6,6 +6,8 @@
           - common-config
         untrusted-projects:
           - org/project1
+          - org/project2
       another_gerrit:
         untrusted-projects:
           - org/project1
+          - org/project2