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/apts/cinder b/files/apts/cinder
index 5db06ea..c45b97f 100644
--- a/files/apts/cinder
+++ b/files/apts/cinder
@@ -1,2 +1,3 @@
 tgt
 lvm2
+qemu-utils