redhat: Add the EPEL repository for moreutils packages

The moreutils 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. Finally, we include the nodepool playbook from the
tests repository in order to populate the necessary CI facts.

Also, we don't need the LXC development headers so drop them.

Change-Id: I287a7209d7840283e374a8bb14d9caa4f714baf0

tasks/repo_build_install.yml

@@ -13,6 +13,33 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Install EPEL gpg keys
+  rpm_key:
+    key: "http://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-7"
+    state: present
+  when:
+    - ansible_pkg_mgr in ['yum', 'dnf']
+  register: _add_yum_keys
+  until: _add_yum_keys | success
+  retries: 5
+  delay: 2
+
+- name: Install the EPEL repository
+  yum_repository:
+    name: epel-repo_build
+    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: 'moreutils perl-Time-Duration'
+  when:
+    - ansible_pkg_mgr in ['yum', 'dnf']
+  register: install_epel_repo
+  until: install_epel_repo|success
+  retries: 5
+  delay: 2
+
 - name: Install packages
   package:
     name: "{{ repo_build_distro_packages }}"

vars/redhat.yml

@@ -24,7 +24,6 @@ repo_build_distro_packages:
   - librados2-devel         # required to build cradox
   - libvirt-devel           # required to build libvirt-python
   - libxslt-devel           # required to build lxml
-  - lxc-devel               # required to build lxc-python2
   - MariaDB-devel           # required to build MySQL-python
   - moreutils               # provides `ts` command to timestamp pip logs
   - openldap-devel          # required to build python-ldap

vars/suse-42.yml

@@ -26,7 +26,6 @@ repo_build_distro_packages:
   - libvirt-devel           # required to build libvirt-python
   - libxslt1
   - libxslt-devel           # required to build lxml
-  - lxc-devel               # required to build lxc-python2
   - MariaDB-devel           # required to build MySQL-python
   - moreutils               # provides `ts` command to timestamp pip logs
   - cyrus-sasl-devel        # required to build python-ldap

vars/ubuntu-16.04.yml

@@ -35,7 +35,6 @@ repo_build_distro_packages:
   - libvirt-dev             # required to build libvirt-python
   - libxslt1-dev            # required to build lxml
   - libxml2-dev             # required to build lxml
-  - lxc-dev                 # required to build lxc-python2
   - moreutils               # provides `ts` command to timestamp pip logs
   - pkg-config
   - python-dev