Refresh Cloud Server data for RackConnect check

Refresh Cloud Server data on each iteration of check_create_complete to
ensure the server metadata is up-to-date for the RackConnect check and
any subsequent checks.

Change-Id: Ia4ad04cfd5e76b639a0b98c21e381db70551090a
Closes-bug: #1250647
Merge "Refresh Cloud Server data for RackConnect check"