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
Internal LB: Pre-select existing VMs on LB rule
CLOUDSTACK-747: internal LB in VPC - fix a bug that Source IP Address column was not filled after Add Internal LB action was complete.