ceph-common: Install yum plugin priorities

When using community repository we need to set the priority on the
ceph repositories because we could have some conflict with EPEL
packages.
In order to set the priority on the ceph repositories, we need to
install the yum-plugin-priorities package.

http://docs.ceph.com/docs/master/install/get-packages/#rpm-packages

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>

roles/ceph-common/tasks/installs/redhat_community_repository.yml

@@ -1,4 +1,12 @@
 ---
+- name: install yum plugin priorities
+  package:
+    name: yum-plugin-priorities
+  register: result
+  until: result is succeeded
+  tags:
+    - with_pkg
+
 - name: configure red hat ceph community repository stable key
   rpm_key:
     key: "{{ ceph_stable_key }}"
@@ -15,6 +23,7 @@
     gpgkey: "{{ ceph_stable_key }}"
     baseurl: "{{ ceph_mirror }}/rpm-{{ ceph_stable_release }}/{{ ceph_stable_redhat_distro }}/$basearch"
     file: ceph_stable
+    priority: 2
   register: result
   until: result is succeeded
 
@@ -27,5 +36,6 @@
     gpgkey: "{{ ceph_stable_key }}"
     baseurl: "{{ ceph_mirror }}/rpm-{{ ceph_stable_release }}/{{ ceph_stable_redhat_distro }}/noarch"
     file: ceph_stable
+    priority: 2
   register: result
   until: result is succeeded