Correctly map kolla_base_distro_version

Author: MoteHue

etc/kayobe/kolla/globals.yml

@@ -12,7 +12,7 @@ kolla_base_distro: "{% raw %}{{ ansible_facts.distribution | lower }}{% endraw %
 
 # Use facts so this is determined correctly when the control host OS differs
 # from os_distribuition.
-kolla_base_distro_version: "{% raw %}{{ ansible_facts.distribution_major_version }}{% endraw %}"
+kolla_base_distro_version: "{% raw %}{{ kolla_base_distro_version_default_map[kolla_base_distro] }}{% endraw %}"
 
 # Convenience variable for base distro and version string.
 kolla_base_distro_and_version: "{% raw %}{{ kolla_base_distro }}-{{ kolla_base_distro_version }}{% endraw %}"