Add kolla version to base container

We want to record kolla version of running containers to be able to
detect whether or not we need to perform certain downtime-causing
actions during upgrade.

Change-Id: Ie113029da98303e6809d56edbf6d8de37be128d7
Implements: blueprint record-version

docker/base/Dockerfile.j2

@@ -1,6 +1,8 @@
 FROM {{ base_distro }}:{{ base_distro_tag }}
 MAINTAINER {{ maintainer }}
 
+LABEL kolla_version="{{ kolla_version }}"
+
 {# Early failure for bases and types #}
 {% if base_distro in ['fedora', 'centos', 'oraclelinux', 'rhel'] %}
     {% if install_type not in ['source', 'binary', 'rdo', 'rhel'] %}

kolla/cmd/build.py

@@ -434,7 +434,8 @@ class KollaWorker(object):
                       'install_type': self.install_type,
                       'namespace': self.namespace,
                       'tag': self.tag,
-                      'maintainer': self.maintainer}
+                      'maintainer': self.maintainer,
+                      'kolla_version': get_kolla_version()}
             if self.include_header:
                 with open(self.include_header, 'r') as f:
                     values['include_header'] = f.read()