redhat: Add the EPEL repository for aria2 and python2-lxc packages

The ARIA2 package is needed from EPEL so we install it inside
the role. Moreover, in order to minimize the potential EPEL vs RDO
package conflicts, we only allow a small subset of packages from the
EPEL repository. This also removes the 'debootstrap' package from
CentOS since it's not needed. Finally, we include the nodepool playbook
from the tests repository in order to populate the necessary CI facts.

Depends-On: https://review.openstack.org/#/c/574801/
Depends-On: https://review.openstack.org/#/c/575059/
Change-Id: Icd4d09a26cd95ecfefec26142723ddffe81aae74
Co-Authored-By: Markos Chandras <mchandras@suse.de>

tasks/lxc_install_yum.yml

@@ -75,6 +75,29 @@
     - "rsync -a --delete /tmp/thm-lxc2.0/ /opt/thm-lxc2.0/"
     - "yum-config-manager --enable thm-lxc2.0-local"
 
+- name: Install EPEL gpg keys
+  rpm_key:
+    key: "http://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-7"
+    state: present
+  register: _add_yum_keys
+  until: _add_yum_keys | success
+  retries: 5
+  delay: 2
+
+- name: Install the EPEL repository
+  yum_repository:
+    name: epel-lxc_hosts
+    baseurl: "{{ (centos_epel_mirror | default ('http://download.fedoraproject.org/pub/epel')) ~ '/' ~ ansible_distribution_major_version ~ '/' ~ ansible_architecture }}"
+    description: 'Extra Packages for Enterprise Linux 7 - $basearch'
+    gpgcheck: yes
+    enabled: yes
+    state: present
+    includepkgs: 'aria2 python2-lxc'
+  register: install_epel_repo
+  until: install_epel_repo|success
+  retries: 5
+  delay: 2
+
 - name: Install distro packages
   package:
     pkg: "{{ lxc_hosts_distro_packages }}"

tests/test.yml

@@ -44,12 +44,7 @@
       set_fact:
         lxc_container_ssh_key: "{{ _root_ssh_key['content'] | b64decode }}"
 
-    # This is a temporary hack to override the LXC image source to
-    # the reverse proxy if the test is run in OpenStack-Infra.
-    - name: Check if this is an OpenStack-CI nodepool instance
-      stat:
-        path: /etc/nodepool/provider
-      register: nodepool
+    - include_tasks: "common/common-tasks/test-set-nodepool-vars.yml"
 
   roles:
     - role: "lxc_hosts"

vars/redhat-7-host.yml

@@ -22,7 +22,6 @@ lxc_hosts_distro_packages:
   - bridge-utils
   - btrfs-progs
   - dbus
-  - debootstrap
   - dnsmasq
   - git
   - libseccomp