Add DHCP RPC API support to NEC OpenFlow plugin
Add DHCP RPC API support to NEC OpenFlow plugin

It is necessary to use DHCP with NEC OpenFlow plugin.

Fixes bug 1048622

Change-Id: Ia33e1157644232504c1d4683bbc83d678fb58409

gkotton/vmware-nsx,gkotton/vmware-nsx