Start/stop vm/dhcp server are done. Not done with VM migration.
A new command(PvlanSetupCommand) is sent for setting up PVLAN for vms. Currently
it's focus on OVS implementation. Need to be more abstruct and add vSwitch part.
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