Avoid pm-is-supported spam in logs

Per the libvirt team, the only way to stop the spam in
libvirtd logs is to install pm-utils package. Details are in:

https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/994476

Closes-Bug: #1274772
Closes-Bug: #1297512

Change-Id: Ia2f7a388470dcd8a3e2c12cf2980beccd65af94c
diff --git a/files/apts/nova b/files/apts/nova
index ae925c3..5e6d39d 100644
--- a/files/apts/nova
+++ b/files/apts/nova
@@ -15,6 +15,7 @@
 kvm # NOPRIME
 qemu # dist:wheezy,jessie NOPRIME
 libvirt-bin # NOPRIME
+pm-utils
 libjs-jquery-tablesorter # Needed for coverage html reports
 vlan
 curl