[ussuri-only] Don't use yum to install ceph

Use the ansible builtin 'package' module instead, and
reinstate the cinderlib-ceph-functional job as voting.
(It was made non-voting by change If039438a8e84.)

(This patch is basically change I244c1896a3c1 plus the
zuul.yaml change.)

Change-Id: If88708f299f8e0b7a316f9af94db78d021b0fbc7

.zuul.yaml

@@ -9,8 +9,7 @@
         - cinderlib-tox-py36
         - cinderlib-tox-py37
 
-        - cinderlib-ceph-functional:
-            voting: false
+        - cinderlib-ceph-functional
         - cinder-tempest-plugin-lvm-lio-barbican
     gate:
       queue: integrated
@@ -19,8 +18,7 @@
         - cinderlib-tox-py36
         - cinderlib-tox-py37
 
-        - cinderlib-ceph-functional:
-            voting: false
+        - cinderlib-ceph-functional
         - cinder-tempest-plugin-lvm-lio-barbican
     post:
       jobs:

playbooks/setup-ceph.yaml

@@ -34,7 +34,7 @@
           state: absent
 
       - name: Install ceph requirements
-        yum:
+        package:
           name:
             - ceph-common
             - python3-rados
@@ -42,7 +42,7 @@
           state: present
 
       - name: Install Docker
-        yum:
+        package:
           name: 'docker.io'
           state: present