Added Azure pipelines to build test containers

Added a pipeline file (tests/azure/build-containers.yml) to build test
containers and upload them to quay.io. The pipeline will create
containers with IPA pre-installed for testing proposes on three
different Linux containers: CentOS 7, CentOS 8 and Fedora Latest.

molecule/resources/playbooks/prepare.yml

@@ -2,12 +2,14 @@
 - name: Converge
   hosts: all
   tasks:
+  - include_tasks: prepare-common.yml
+
   - name: Ensure lock dirs for DS exists
     file:
       state: directory
       owner: dirsrv
       group: dirsrv
-      path: "{{ item }} "
+      path: "{{ item }}"
     loop:
       - /var/lock/dirsrv/
       - /var/lock/dirsrv/slapd-TEST-LOCAL/