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

fawadkhaliq/networking-plumgrid,stackforge/networking-plumgrid,openstack/networking-plumgrid,msagheer/networking-plumgrid,openstack/networking-plumgrid,msagheer/networking-plumgrid,fawadkhaliq/networking-plumgrid,stackforge/networking-plumgrid