CI: Install qemu-img for unit tests

Change-Id: I3b38344a127764b4fa62fe062e825074d6deab60
(cherry picked from commit 416ac36)

Author: priteau

bindep.txt

@@ -54,3 +54,5 @@ pcre-devel [platform:rpm test]
 # runtime and in unit tests. Net result is the same that lsscsi will be
 # installed for any nova installation.
 lsscsi
+# NOTE(priteau): Install qemu-img for format inspector tests
+qemu-utils [platform:dpkg test]