interface-config validator: added interface-role action. Refs #2103
NetworkAdapter UI module: validate interface changes with "interface-config" platform validator. Refs #2103
NetworkAdapter UI: don't actually delete interface record; set role prop to '' instead. Refs #2103
NetworkAdapter UI: remove delete action on unconfigured interfaces. Refs #2103
NetworkAdapter UI module: refactored Modify module adding getNicInfo() method. Refs #2103
/etc/sudoers template (20nics): removed, nic-info can run unprivileged, update-networks-db is no longer invoked by httpd-admin. Refs #2075