fix testcase test_check_can_live_migrate_dest_fills_listen_addrs
fix testcase test_check_can_live_migrate_dest_fills_listen_addrs

We should set return_value=1 for compareCPU hook.
Otherwise we'll get an exception InvalidCPUInfo:
CPU doesn't have compatibility

Change-Id: Id9313eb46084e60cf0c7f5a77fe9a8a7dc86b8fb
Closes-Bug: #1634962

rahulunair/nova,rajalokan/nova,phenoxim/nova,Juniper/nova,mahak/nova,Juniper/nova,mahak/nova,Juniper/nova,klmitch/nova,phenoxim/nova,jianghuaw/nova,mahak/nova,rajalokan/nova,openstack/nova,klmitch/nova,hanlind/nova,jianghuaw/nova,vmturbo/nova,rajalokan/nova,gooddata/openstack-nova,vmturbo/nova,vmturbo/nova,rajalokan/nova,jianghuaw/nova,hanlind/nova,vmturbo/nova,openstack/nova,jianghuaw/nova,gooddata/openstack-nova,rahulunair/nova,Juniper/nova,mikalstill/nova,mikalstill/nova,rahulunair/nova,openstack/nova,mikalstill/nova,gooddata/openstack-nova,klmitch/nova,klmitch/nova,gooddata/openstack-nova,hanlind/nova