Merge pull request #730 from blrm/master

Blocks environment label tests due to regression
added ntpdate to sync client with clock.redhat.com
Fixed system test: Re-register a system to different env
Merge pull request #731 from sghai/client-check

added ntpdate to sync client with clock.redhat.com
Merge pull request #732 from sghai/system-test

Fixed system test: Re-register a system to different env