Merge remote-tracking branch 'allegro/develop' into switch_stack
Merge remote-tracking branch 'allegro/develop' into env_and_dhcp
changes in environments
migration added
dhcp networks config - dns servers are required
dhcp configs - new comments
last_modified_data - fix
configs for many data_centers or environments; additional tests
scan - saving fix
Merge pull request #823 from andrzej-jankowski/env_and_dhcp

DHCP, Environments and Scan improvements