Fix missing privilege escalation, redfish tests

Please note, in near future we will remove escalation where ever
we can to make sure that we can securely build not only gates
but also development environment

Change-Id: I38045b45607b519699b232b35dd5e1f48a88febc

roles/redfish-emulator/tests/main.yml

@@ -22,6 +22,8 @@
 - name: create libvirt domains
   include_role:
     name: libvirt-domain
+  vars:
+    ansible_become: true
 - name: install sushy-tools
   include_role:
     name: redfish-emulator