Throttle requests to VSM.
Combine subnet-create and network-update calls while subnet creation.
Combine vm network create and port create calls while port creation.
Merge branch 'n1k-grizzly' of https://github.com/CiscoSystems/neutron into n1k-grizzly

Conflicts:
	quantum/plugins/cisco/n1kv/n1kv_client.py
	quantum/plugins/cisco/n1kv/n1kv_quantum_plugin.py