CLOUDSTACK-3753: UI > Infrastructure > zone > physical network > Guest > Edit action - make VLAN Range(s) editable. This is corresponding UI change to recent change of updatePhysicalNetwork API.
CLOUDSTACK-4020: lock nic entry in releaseNic method. Otherwise multiple threads can try to release the same nic at the same time, and it will lead to NPEs and backend failures

Conflicts:
	server/src/com/cloud/network/NetworkManagerImpl.java
	server/src/com/cloud/vm/VirtualMachineManagerImpl.java