Patch mkisofs calls
Patch mkisofs calls

The nova unit tests recently started to fail on systems lacking mkisofs
(like mac osx). Skip these mkisofs calls by patching _make_iso9660.

Change-Id: I350aafa878616f74df506c1bc9ee5f26ea06fe97
Closes-Bug: #1630420

mikalstill/nova,gooddata/openstack-nova,phenoxim/nova,rahulunair/nova,vmturbo/nova,jianghuaw/nova,phenoxim/nova,rajalokan/nova,klmitch/nova,rahulunair/nova,rajalokan/nova,gooddata/openstack-nova,cloudbase/nova,hanlind/nova,hanlind/nova,mahak/nova,gooddata/openstack-nova,klmitch/nova,jianghuaw/nova,openstack/nova,rajalokan/nova,mahak/nova,cloudbase/nova,mikalstill/nova,klmitch/nova,openstack/nova,jianghuaw/nova,vmturbo/nova,Juniper/nova,rajalokan/nova,sebrandon1/nova,vmturbo/nova,gooddata/openstack-nova,mikalstill/nova,Juniper/nova,vmturbo/nova,jianghuaw/nova,klmitch/nova,Juniper/nova,mahak/nova,sebrandon1/nova,hanlind/nova,Juniper/nova,openstack/nova,cloudbase/nova,rahulunair/nova,sebrandon1/nova