Optimise the tag for common role

Change-Id: I47b329bb3e16aa33a5e0a156aca515a666cd98e4

ansible/roles/common/defaults/main.yml

@@ -44,16 +44,19 @@ common_services:
 ####################
 # Docker
 ####################
-kolla_toolbox_image: "{{ docker_registry ~ '/' if docker_registry else '' }}{{ docker_namespace }}/{{ kolla_base_distro }}-{{ kolla_install_type }}-kolla-toolbox"
-kolla_toolbox_tag: "{{ openstack_release }}"
+common_install_type: "{{ kolla_install_type }}"
+common_tag: "{{ openstack_release }}"
+
+kolla_toolbox_image: "{{ docker_registry ~ '/' if docker_registry else '' }}{{ docker_namespace }}/{{ kolla_base_distro }}-{{ common_install_type }}-kolla-toolbox"
+kolla_toolbox_tag: "{{ common_tag }}"
 kolla_toolbox_image_full: "{{ kolla_toolbox_image }}:{{ kolla_toolbox_tag }}"
 
-cron_image: "{{ docker_registry ~ '/' if docker_registry else '' }}{{ docker_namespace }}/{{ kolla_base_distro }}-{{ kolla_install_type }}-cron"
-cron_tag: "{{ openstack_release }}"
+cron_image: "{{ docker_registry ~ '/' if docker_registry else '' }}{{ docker_namespace }}/{{ kolla_base_distro }}-{{ common_install_type }}-cron"
+cron_tag: "{{ common_tag }}"
 cron_image_full: "{{ cron_image }}:{{ cron_tag }}"
 
-fluentd_image: "{{ docker_registry ~ '/' if docker_registry else '' }}{{ docker_namespace }}/{{ kolla_base_distro }}-{{ kolla_install_type }}-fluentd"
-fluentd_tag: "{{ openstack_release }}"
+fluentd_image: "{{ docker_registry ~ '/' if docker_registry else '' }}{{ docker_namespace }}/{{ kolla_base_distro }}-{{ common_install_type }}-fluentd"
+fluentd_tag: "{{ common_tag }}"
 fluentd_image_full: "{{ fluentd_image }}:{{ fluentd_tag }}"
 
 syslog_swift_facility: "local0"