Support push kolla tag image to hub.docker.com site

Change-Id: I8a21f60a37ba038e46c29d0bcff9ffbd2457a257

.zuul.d/centos.yaml

@@ -19,6 +19,10 @@
       jobs:
         - kolla-publish-centos-source
         - kolla-publish-centos-binary
+    release:
+      jobs:
+        - kolla-publish-centos-source
+        - kolla-publish-centos-binary
 
 - job:
     name: kolla-build-centos-binary

.zuul.d/oraclelinux.yaml

@@ -19,6 +19,10 @@
       jobs:
         - kolla-publish-oraclelinux-source
         - kolla-publish-oraclelinux-binary
+    release:
+      jobs:
+        - kolla-publish-oraclelinux-source
+        - kolla-publish-oraclelinux-binary
 
 - job:
     name: kolla-build-oraclelinux-binary

.zuul.d/ubuntu.yaml

@@ -19,6 +19,10 @@
       jobs:
         - kolla-publish-ubuntu-source
         - kolla-publish-ubuntu-binary
+    release:
+      jobs:
+        - kolla-publish-ubuntu-source
+        - kolla-publish-ubuntu-binary
 
 - job:
     name: kolla-build-ubuntu-binary

tests/templates/kolla-build.conf.j2

@@ -2,7 +2,7 @@
 debug = true
 {% if publisher %}
 namespace = kolla
-tag = {{ zuul.branch | basename }}
+tag = {{ zuul.tag if zuul.pipeline == "release" else zuul.branch | basename }}
 {% endif %}
 push = false
 logs_dir = /tmp/logs/build