Zun: rename higgins to zun (1)

As due to project name conflicts, rename higgins to zun.
But infra team currently can not do the renaming right now.

This patch is to remove #openstack-higgins to #openstack-zun.

Change-Id: Ia3d7c067892c5a26f752a0af2449b769c05bb908

accessbot/channels.yaml

@@ -120,7 +120,6 @@ channels:
   - name: openstack-gsoc
   - name: openstack-ha
   - name: openstack-heat-translator
-  - name: openstack-higgins
   - name: openstack-horizon
   - name: openstack-hyper-v
   - name: openstack-i18n
@@ -214,6 +213,7 @@ channels:
   - name: openstack-women
   - name: openstack-zaqar
   - name: openstack-zephyr
+  - name: openstack-zun
   - name: osic
   - name: puppet-openstack
   - name: rdo

gerritbot/channels.yaml

@@ -676,16 +676,6 @@ openstack-heat-translator:
   branches:
     - master
 
-openstack-higgins:
-  events:
-    - patchset-created
-    - change-merged
-    - x-vrif-minus-2
-  projects:
-    - openstack/higgins
-  branches:
-    - master
-
 openstack-horizon:
   events:
     - patchset-created
@@ -1945,6 +1935,17 @@ openstack-zaqar:
   branches:
     - master
 
+# rename from higgins to zun after infra team rename higgins
+openstack-zun:
+  events:
+    - patchset-created
+    - change-merged
+    - x-vrif-minus-2
+  projects:
+    - openstack/higgins
+  branches:
+    - master
+
 puppet-openstack:
   events:
     - patchset-created