CLOUDSTACK-747: UI - create network offering - default sourceNat type as per account instead of per zone.
CLOUDSTACK-747: internalLb in VPC - Infrastructure menu - network service provider - add InternalLbVm. Clicking it will lead to a screen that can enable/disable provider and have instances tab that can start/stop LB Instance.
CLOUDSTACK-747: internal LB in VPC - remove module internalLbProvider since internalLbVm section has been added in system.js