Add restproxy.ini to config_path in setup.py.
Add restproxy.ini to config_path in setup.py.

Fixes LP Bug #1090450

Change-Id: I4969cafba9f5650fa556d39885b58b2a52a85fe0

schoksey/networking-odl,gaolichuang/neutron-fwaas,openstack/networking-odl,dougwig/x-neutron-lbaas,openstack/neutron-vpnaas,citrix-openstack-build/neutron-fwaas,openstack/neutron-fwaas,openstack/neutron-vpnaas,gaolichuang/neutron-fwaas,flavio-fernandes/networking-odl,CiscoSystems/networking-odl,citrix-openstack-build/neutron-vpnaas,openstack/networking-odl,gandelman-a/neutron-lbaas,dougwig/x-neutron-fwaas,gotostack/neutron-lbaas,FedericoRessi/networking-odl,dougwig/x-neutron-vpnaas,schoksey/networking-odl,mestery/x-stackforge-odl,gotostack/neutron-lbaas,gandelman-a/neutron-lbaas,gandelman-a/neutron-lbaas,CiscoSystems/networking-odl,openstack/networking-odl,citrix-openstack-build/neutron-lbaas,FedericoRessi/networking-odl,flavio-fernandes/networking-odl,openstack/neutron-fwaas,gotostack/neutron-lbaas