Detect openstack_release variable when it auto

Get openstack_release variable from kolla-ansible version number when it
is auto.

Change-Id: Ibd0d8f85aed9d8198218c0dc85c367b331815100

ansible/group_vars/all.yml

@@ -233,7 +233,7 @@ admin_protocol: "http"
 ####################
 # OpenStack options
 ####################
-openstack_release: "4.0.0"
+openstack_release: "auto"
 openstack_logging_debug: "False"
 
 openstack_region_name: "RegionOne"

ansible/site.yml

@@ -31,6 +31,21 @@
       when:
         - (play_hosts | length) != (groups['all'] | length)
 
+- name: Detect openstack_release variable
+  hosts: all
+  gather_facts: false
+  tasks:
+    - name: Get current kolla-ansible version number
+      local_action: command python -c "import pbr.version; print(pbr.version.VersionInfo('kolla-ansible'))"
+      register: kolla_ansible_version
+      changed_when: false
+      when: openstack_release == "auto"
+
+    - name: Set openstack_release variable
+      set_fact:
+        openstack_release: "{{ kolla_ansible_version.stdout }}"
+      when: openstack_release == "auto"
+
 - name: Apply role prechecks
   hosts:
     - all

etc/kolla/globals.yml

@@ -17,7 +17,7 @@
 #kolla_install_type: "binary"
 
 # Valid option is Docker repository tag
-#openstack_release: "4.0.0"
+#openstack_release: "auto"
 
 # Location of configuration overrides
 #node_custom_config: "/etc/kolla/config"