CS-21121: UI for Baremetal RCT - (1) Global Settings > add new option "Baremetal Rack Configuration" in Select view dropdown. (2) implement "Add Baremetal Rack Configuration" action.
CLOUDSTACK-7601: UI > Global Settings > Baremetal Rack Configuration > populate listView by listBaremetalRct API.
appliance: add license headers to new vbox cleaner rb scripts

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>