In the "Update Aggregate" API,
if both an availability zone and a name are not specified,
a 400 error is returned.
It should be checked in the novaclient side (nova command).
So add the validation for it at the 'nova aggregate-update' command.
Change-Id: If50579ef3572a10b67e6da32e3258917901e9d9d
Closes-Bug: #1696891