sync config_template plugin with master branch

sync config_template plugin with master branch

ansible 2.2 deprecates first_available_file option which is used in
the config_template module by 'generate ceph configuration file' task.

This change syncs the config_module files from their master repository
in github.com/openstack/openstack/ansible-plugins which includes the fix

https://github.com/openstack/openstack-ansible-plugins/commit/2f6cac2cf6ddebf462e21c70da7f60fa334b5f1e

Signed-off-by: Alberto Murillo Silva <alberto.murillo.silva@intel.com>