Manually install EPEL dependencies

Sadly, we need EPEL for some centos dependencies. Manually install
them to avoid the need of enabling EPEL all the time.

Change-Id: Ib64502338633402de7b267b166cf1da975ff4b17
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

tests/test.yaml

@@ -18,6 +18,19 @@
     diskimage_builder_git_update: false
     rolename: ansible-role-diskimage-builder
 
+  pre_tasks:
+    # NOTE(pabelanger): Manually install EPEL dependencies as not to keep EPEL
+    # enabled.
+    - name: Manually install EPEL dependencies
+      become: yes
+      yum:
+        name: "{{ item }}"
+        enablerepo: epel
+        state: present
+      when: ansible_distribution == "CentOS"
+      with_items:
+        - debootstrap
+
   roles:
     - "{{ rolename }}"