xenapi: Add qemu-utils as a cinder dependency

If you are using xenapi, your system won't have qemu-img installed. This
patch adds the package qemu-utils to the list of cinder
apts/rpms/suse-rpms, thus devstack will pull the required binaries.

Change-Id: Id701880ce03bb3e78223df0af6a00b052408407c
diff --git a/files/rpms/cinder b/files/rpms/cinder
index df861aa..19dedff 100644
--- a/files/rpms/cinder
+++ b/files/rpms/cinder
@@ -1,2 +1,3 @@
 lvm2
 scsi-target-utils
+qemu-img