1) Added new set of Interfaces - including the new VO - for the internal load balancer
2) DB change - added source_ip_address/source_ip_address_network_id/scheme (Internal/Public) fields to the load_balancer table
1) Added comments to VPC/VPCService/VPCManager interfaces
2) Moved VPC offering related methods from VpcService to the new interface - VpcProvisioningService
3) Fixed static nat creation in the VPC - used to result in NPE due to invalid method referencing while obtaining VPC VR information