Fix manila-tempest-*-centos-7 jobs

There was a recent change announced on the CentOS
mailing lists [1] regarding housing centos-release-SIG
repos for CPU architectures other than x86_64. We rely on
centos-release-pike within our test jobs and the
repo centos-qemu-ev is found under [2].

There is now a YUM variable called $contentdir
which determines where the repos may be, and this
variable isn't set in the base images.

With $contentdir set, the URLs resolve correctly
within /etc/yum.repos.d/CentOS-QEMU-EV.repo.

See corresponding fixes for kolla [3] and
tripleo-quickstart-extras [4]

[1] https://lists.centos.org/pipermail/centos-devel/2018-March/016542.html
[2] http://mirror.centos.org/centos/7/virt/x86_64/kvm-common
[3] Ieb26c0aa65ba3ec1a45a33f87f670e5ecb782f82
[4] I6279bd4088bd87f37c58b7da25b675c5456506d6

Change-Id: Idcacfb6dbfb0760128f10dbc0573856e4250b3bc
Closes-Bug: #1771969

playbooks/legacy/manila-tempest-minimal-dsvm-cephfs-native-centos-7/run.yaml

@@ -31,6 +31,32 @@
         name: centos-release-openstack-pike
         state: present
 
+    - name: Check for /etc/yum/vars/contentdir
+      stat:
+        path: /etc/yum/vars/contentdir
+      register: yum_contentdir
+
+    - when: not yum_contentdir.stat.exists
+      block:
+
+      - name: Discover package architecture
+        command: rpm -q --qf "%{arch}" -f /etc/redhat-release
+        register: rpm_arch
+
+      - debug:
+          msg: Package architecture is '{{ rpm_arch.stdout }}'
+
+      - name: Set contentdir to altarch
+        set_fact:
+          yum_contentdir: altarch
+        when: rpm_arch.stdout in ['aarch64', 'ppc64le']
+
+      - name: Populate /etc/yum/vars/contentdir
+        copy:
+          dest: /etc/yum/vars/contentdir
+          content: "{{ yum_contentdir|default('centos') }}"
+        become: true
+
     - shell:
         cmd: |
           set -e

playbooks/legacy/manila-tempest-minimal-dsvm-cephfs-nfs-centos-7/run.yaml

@@ -31,6 +31,32 @@
         name: centos-release-openstack-pike
         state: present
 
+    - name: Check for /etc/yum/vars/contentdir
+      stat:
+        path: /etc/yum/vars/contentdir
+      register: yum_contentdir
+
+    - when: not yum_contentdir.stat.exists
+      block:
+
+      - name: Discover package architecture
+        command: rpm -q --qf "%{arch}" -f /etc/redhat-release
+        register: rpm_arch
+
+      - debug:
+          msg: Package architecture is '{{ rpm_arch.stdout }}'
+
+      - name: Set contentdir to altarch
+        set_fact:
+          yum_contentdir: altarch
+        when: rpm_arch.stdout in ['aarch64', 'ppc64le']
+
+      - name: Populate /etc/yum/vars/contentdir
+        copy:
+          dest: /etc/yum/vars/contentdir
+          content: "{{ yum_contentdir|default('centos') }}"
+        become: true
+
     - shell:
         cmd: |
           set -e

playbooks/legacy/manila-tempest-minimal-dsvm-lvm-centos-7/run.yaml

@@ -46,6 +46,32 @@
         chdir: '{{ ansible_user_dir }}/workspace'
       environment: '{{ zuul | zuul_legacy_vars }}'
 
+    - name: Check for /etc/yum/vars/contentdir
+      stat:
+        path: /etc/yum/vars/contentdir
+      register: yum_contentdir
+
+    - when: not yum_contentdir.stat.exists
+      block:
+
+      - name: Discover package architecture
+        command: rpm -q --qf "%{arch}" -f /etc/redhat-release
+        register: rpm_arch
+
+      - debug:
+          msg: Package architecture is '{{ rpm_arch.stdout }}'
+
+      - name: Set contentdir to altarch
+        set_fact:
+          yum_contentdir: altarch
+        when: rpm_arch.stdout in ['aarch64', 'ppc64le']
+
+      - name: Populate /etc/yum/vars/contentdir
+        copy:
+          dest: /etc/yum/vars/contentdir
+          content: "{{ yum_contentdir|default('centos') }}"
+        become: true
+
     - shell:
         cmd: |
           set -e