IRC #openstack-ironic gerritbot CI failed messages

When a gerrit comment of type Verified with value -2 is posted, send a
message to the #openstack-ironic channel.

This will raise awareness of CI job failures preventing changes from
landing, and is proposed as a trial for later refinement.

Update irc_tests.py for the dependend change to pass tests.

Change-Id: I251e9e5ea760fe5da1a8fbca7cee365dd3ae563b
Depends-On: https://review.opendev.org/#/c/698089/

gerritbot/channels.yaml

@@ -995,6 +995,8 @@ openstack-ironic:
   events:
     - patchset-created
     - change-merged
+    - comments-added
+    - x-vrif-minus-2
   projects:
     - openstack/bifrost
     - openstack/ironic

tools/irc_tests.py

@@ -35,7 +35,8 @@ def access_gerrit_check():
 
     print("Basic check of gerritbot/channels.yaml")
     REQUIRED_ENTRIES = ("branches", "events", "projects")
-    VALID_EVENTS = ("change-merged", "patchset-created")
+    VALID_EVENTS = ("change-merged", "comments-added",
+                    "patchset-created", "x-vrif-minus-2")
     for channel in gerrit_config:
         for entry in REQUIRED_ENTRIES:
             if entry not in gerrit_config[channel]: