Code review comment for lp:~mpontillo/maas/vmware-fixes--bug-1515188

Tested this end-to-end on Ante's VMware setup since I no longer have any VMware running in my own test bed. It solves the issue, when you add the chassis like this:

maas profile machines add-chassis chassis_type=vmware username=root password='xxxx' protocol='https+unverified' hostname=1.2.3.4 prefix_filter=maas