Remove support for Centos-7

Openstack-ansible does not support Centos-7 beyond Ussuri so drop
support for Victoria.

Depends-On: https://review.opendev.org/742166
Depends-On: https://review.opendev.org/742103
Change-Id: I6f72eb69f54ae780712831dbcb2f9151478e8b83

meta/main.yml

@@ -28,7 +28,7 @@ galaxy_info:
         - bionic
     - name: EL
       versions:
-        - 7
+        - 8
     - name: opensuse
       versions:
         - 15.0

vars/redhat-7.yml

@@ -1,29 +0,0 @@
----
-# Copyright 2016, Rackspace US, Inc.
-#
-# 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.
-
-lxc_container_map:
-  distro: centos
-  arch: amd64
-  release: 7
-
-lxc_container_default_config_list:
-  - "lxc.start.auto=1"
-  - "lxc.start.delay=15"
-  - "lxc.group=onboot"
-  - "lxc.group=openstack"
-  - "lxc.autodev=1"
-  - "lxc.pts=1024"
-  - "lxc.kmsg=0"
-  - "lxc.hook.autodev=/var/lib/lxc/{{ inventory_hostname }}/autodev"

zuul.d/project.yaml

@@ -27,4 +27,5 @@
         - openstack-ansible-zfs-ubuntu-bionic
     gate:
       jobs:
+        - openstack-ansible-dir-centos-8
         - openstack-ansible-dir-ubuntu-bionic