Merge "Make installation of epel-release optional"

ansible/baremetal-compute-inspect.yml

ansible/baremetal-compute-manage.yml

ansible/baremetal-compute-provide.yml

ansible/compute-node-flavors.yml

ansible/external-net.yml

ansible/group_vars/all/yum

ansible/kolla-ansible.yml

ansible/kolla-build.yml

ansible/overcloud-grafana-configure.yml

...le/overcloud-introspection-rules-dell-lldp-workaround.yml

ansible/overcloud-introspection-rules.yml

ansible/overcloud-ipa-images.yml

ansible/roles/kolla-ansible/defaults/main.yml

ansible/roles/kolla-ansible/tasks/install.yml

ansible/roles/kolla-ansible/templates/globals.yml.j2

ansible/roles/kolla/defaults/main.yml

ansible/roles/kolla/tasks/install.yml

ansible/seed-introspection-rules.yml

ansible/test-image-centos-cloud.yml

ansible/test-image.yml