CLOUDSTACK-4608: Resolve the hostname to fqdn from marvin config

In case the marvin configuration does not contain fqdn information fetch
and compare the fqdns of hostip from `cloud`.`host` with the fqdn
available on the client.

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit 433d5839a196dd4a8ecc49abc192c580d79c175d)