containerd,docker: stop installing extras repo on CentOS/RHEL (#7203)

This was introduced in 143e2272ff
Extra repo is enabled by default in CentOS, and is not the right repo for EL8
Instead of adding a CentOS repo to RHEL, enable the needed RHEL repos with rhsm_repository

For RHEL 7, we need the "extras" repo for container-selinux
For RHEL 8, we need the "appstream" repo for container-selinux, ipvsadm and socat

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

roles/bootstrap-os/tasks/bootstrap-redhat.yml

@@ -60,6 +60,28 @@
     - rh_subscription_username is defined
     - rh_subscription_status.changed
 
+# container-selinux is in extras repo
+- name: Enable RHEL 7 repos
+  rhsm_repository:
+    name:
+      - "rhel-7-server-rpms"
+      - "rhel-7-server-extras-rpms"
+    state: enabled
+  when:
+    - rhel_enable_repos | default(True)
+    - ansible_distribution_major_version == "7"
+
+# container-selinux is in appstream repo
+- name: Enable RHEL 8 repos
+  rhsm_repository:
+    name:
+      - "rhel-8-for-*-baseos-rpms"
+      - "rhel-8-for-*-appstream-rpms"
+    state: enabled
+  when:
+    - rhel_enable_repos | default(True)
+    - ansible_distribution_major_version == "8"
+
 - name: Check presence of fastestmirror.conf
   stat:
     path: /etc/yum/pluginconf.d/fastestmirror.conf