Simplify network scope setting logic
Simplify network scope setting logic

- in driver(), no need to check for isAgent

Signed-off-by: Alessandro Boch <5bd2eb5b6f60921d9a2b9cb6a0a86bb947f3d361@docker.com>

fcrisciani/libnetwork,abhi/libnetwork,mahak/libnetwork,WeiZhang555/libnetwork,kolyshkin/libnetwork,docker/libnetwork,docker/libnetwork,vdemeester/libnetwork,ityangchen/libnetwork,ityangchen/libnetwork,docker/libnetwork,abhi/libnetwork,medallia/libnetwork,vdemeester/libnetwork,mahak/libnetwork,kolyshkin/libnetwork,mahak/libnetwork,abhi/libnetwork,medallia/libnetwork,medallia/libnetwork,allencloud/libnetwork,WeiZhang555/libnetwork,fcrisciani/libnetwork,vdemeester/libnetwork,kolyshkin/libnetwork,allencloud/libnetwork