Remove centos-7 testing

As we are planning on moving to python3 only, we can't actually test
that on centos-7. This is okay for now, since we provide testing on
fedora-27.

Change-Id: I8f2e9fafb6e5cf90efa25ba59d57e8aab00aee02
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

.zuul.yaml

@@ -6,11 +6,6 @@
     roles:
       - zuul: openstack/ansible-role-diskimage-builder
 
-- job:
-    name: ansible-role-diskimage-builder-centos-7
-    parent: ansible-role-diskimage-builder
-    nodeset: centos-7
-
 - job:
     name: ansible-role-diskimage-builder-fedora-27
     parent: ansible-role-diskimage-builder
@@ -33,14 +28,12 @@
       - windmill-jobs-xenial
     check:
       jobs:
-        - ansible-role-diskimage-builder-centos-7
         - ansible-role-diskimage-builder-fedora-27
         - ansible-role-diskimage-builder-ubuntu-bionic
         - ansible-role-diskimage-builder-ubuntu-xenial
         - tox-linters
     gate:
       jobs:
-        - ansible-role-diskimage-builder-centos-7
         - ansible-role-diskimage-builder-fedora-27
         - ansible-role-diskimage-builder-ubuntu-xenial
         - tox-linters

tests/test.yaml

@@ -17,19 +17,6 @@
     diskimage_builder_git_update: false
     rolename: ansible-role-diskimage-builder
 
-  pre_tasks:
-    # NOTE(pabelanger): Manually install EPEL dependencies as not to keep EPEL
-    # enabled.
-    - name: Manually install EPEL dependencies
-      become: yes
-      yum:
-        name: "{{ item }}"
-        enablerepo: epel
-        state: present
-      when: ansible_distribution == "CentOS"
-      with_items:
-        - debootstrap
-
   roles:
     - "{{ rolename }}"