This is a backport of #48833 for stable-2.7.
The compose, groups, and keyed_groups functionality of the openstack
inventory plugin was broken:
- the plugin was not passing the correct variables to the
Constructable methods for compose and groups
- the plugin was simply never calling the appropriate method for
implementing keyed_groups
This commit fixes both issues.
(cherry picked from commit 5a9c7676620d4971eb6ce8d4014e3636b21e3f03)
