Add gerritbot for StarlingX (openstack/stx-*) projects to #starlingx IRC channel

Change-Id: I1af0cab51cb64d0173af3706d14a4785d1cae318
Signed-off-by: Austin Sun <austin.sun@intel.com>

accessbot/channels.yaml

@@ -256,6 +256,7 @@ channels:
   - name: scientific-wg
   - name: senlin
   - name: solum
+  - name: starlingx
   - name: storyboard
   - name: surveil
   - name: swiftonfile

gerritbot/channels.yaml

@@ -2297,6 +2297,18 @@ solum:
   branches:
     - master
 
+starlingx:
+  events:
+    - patchset-created
+    - change-merged
+    - x-vrif-minus-2
+  projects:
+    - ^openstack/stx-.*
+  branches:
+    - master
+    - ^m/.*
+    - ^r/.*
+
 storyboard:
   events:
     - patchset-created