Revert "Avoid disabling rhel-7-server-rh-common-rpms"

Originally it was added for missing python-cheetah dep
for openstack-nova. Nova has removed usage of it long
ago with [1]. rhel-7-server-rh-common-rpms should be
disabled once it's usage is over as it packages from
it can conflict with other openstack repos.

If some package which is needed by OpenStack Packages
is missing then instead of adding rhel-7-server-rh-common-rpms
repo consideration should be to add it in RDO.

[1] https://review.opendev.org/#/c/40205

This reverts commit c7219a5a60.

Change-Id: Iad3a1c353c10bb35f9c9ef4076b65f5c84b803b2

diskimage_builder/elements/rhel-common/pre-install.d/00-rhel-registration

@@ -125,6 +125,8 @@ case "${REG_METHOD:-}" in
         subscription-manager repos --disable=\*
         echo "Enabling repos: $user_repos"
         subscription-manager $repos
+        echo "Disabling satellite repo because it is no longer needed"
+        subscription-manager repos --disable ${satellite_repo}
         ;;
     disable)
         echo "Disabling RHEL registration"