Add cASO Docker image

cASO is an OpenStack accounting exporter. For more detail see:
https://github.com/IFCA/caso

Conflicts:
	kolla/common/config.py

(cherry picked from commit e4c1466)
(cherry picked from commit 838078d97bc2399f6e4e5288cfc39b179e6da6d6)
(cherry picked from commit b0e0d4b)

Change-Id: Ifeda576a2b18d31ebbf502fb7a655522f3693f1e
(cherry picked from commit 2d4f808)
(cherry picked from commit 7da8965)
(cherry picked from commit 25a32f0)

Author: dougszumski

docker/caso/Dockerfile.j2

@@ -5,7 +5,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 
 {% import "macros.j2" as macros with context %}
 
-{% if base_distro in ['centos', 'oraclelinux', 'rhel'] %}
+{% if base_distro in ['centos', 'rocky'] %}
     {% set caso_packages = [
         'cronie',
     ] %}