Fix rhpkg breakage

rhpkg provides very specific build of 'rpm' which
causes other OpenStack installation parts to fail (like
undercloud installation).

This change makes sure rpm-build (which pulls rpm)
is NOT installed from rhpkg

Change-Id: Ic25ff4461bb131c284b833a59d0782af6d350bb7

roles/patch_rpm/tasks/main.yml

@@ -41,8 +41,19 @@
           - 'libffi-devel'
           - 'mock'
           - 'openssl-devel'
+        state: present
+      register: task_result
+      until: task_result is success
+      retries: 3
+      delay: 3
+
+    - name: Install rpm-build from non-rhpkg repository
+      become: yes
+      yum:
+        name:
           - 'rpm-build'
         state: present
+        disablerepo: 'rhpkg'
       register: task_result
       until: task_result is success
       retries: 3