CLOUDSTACK-747: internalLb in VPC - UI - create network offering - add LB Type dropdodwn which is shown when VPC is checked and LB service is checked, hidden otherwise. LB Type (publicLb, internalLb) will determine the options in LB Provider dropdown.
CLOUDSTACK-747: internalLb in VPC - UI - create network offering - when VPC checkbox is checked, enable provider InternalLbVm, VpcVirtualRouter, Netscaler. When VPC checkbox is unchecked, disable provider InternalLbVm, VpcVirtualRouter.
CLOUDSTACK-747: internalLb in VPC - UI - create network offering - when Lb service is checked and LB provider is InternalLbVm, pass capability type as lbSchemes and capability value as internal.