When starting cold migration with nova command "nova host-
servers-migrate compute-1", the migration started from all
compute hosts starting with name "compute-1", not only from
compute-1 host. The same thing happens to "nova host-meta",
"nova host-evacuate", "nova host-evacuate-live" as well.
With the "--strict" option added to these nova commands, the
action will be applied to a single compute with the exact
hostname string match, but not to the computes with hostname
substring match. Error handling is also added to these nova
commands such that when specified hostname name does not exist,
"NotFound" will be returned.
Closes-Bug: #1667794
Change-Id: I5610efa160864b0d91cd67961883a6bec5bb8dd0
9213ec2d32