test_rh_metadata: include elnhook

Update the list of webhooks expected by the tests.

Signed-off-by: Scott Weaver <scweaver@redhat.com>

tests/test_rh_metadata.py

@@ -72,6 +72,7 @@ ALL_WEBHOOK_NAMES = [
     'commit_compare',
     'configshook',
     'limited_ci',
+    'elnhook',
     'fixes',
     'jirahook',
     'mergehook',
@@ -106,6 +107,7 @@ ARK_WEBHOOKS = [
     'ack_nack',
     'ckihook',
     'configshook',
+    'elnhook',
     'limited_ci',
     'mergehook',
     'signoff',