Fix podman and buildah only on rhel-8.2

Newer rhel version will provide newer tools, let's allow them for now
and decide if we must get some new redhat-8.3.yml and so on.

Change-Id: I81434e914d9c84a093f726181f7bb4a9b2042062

tripleo_ansible/roles/tripleo_podman/vars/redhat-8.2.yml

@@ -0,0 +1,26 @@
+---
+# Copyright 2019 Red Hat, Inc.
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+
+_tripleo_podman_packages:
+  - podman-1.6.4
+
+_tripleo_buildah_packages:
+  - buildah-1.11.6
+
+_tripleo_podman_purge_packages:
+  - docker
+  - docker-ce

tripleo_ansible/roles/tripleo_podman/vars/redhat.yml

@@ -16,10 +16,10 @@
 
 
 _tripleo_podman_packages:
-  - podman-1.6.4
+  - podman
 
 _tripleo_buildah_packages:
-  - buildah-1.11.6
+  - buildah
 
 _tripleo_podman_purge_packages:
   - docker