removing methods from Vpc appliance;
changing the way VpcElement calls the command;
there is still work tob e done with the destroyPrivateGateway rule.
Conflicts:
server/src/com/cloud/network/rules/VirtualNetworkApplianceFactory.java
server/src/org/apache/cloudstack/network/topology/BasicNetworkTopology.java
server/src/org/apache/cloudstack/network/topology/NetworkTopology.java