Remove overlay's ipAllocator
Remove overlay's ipAllocator

- A vestige of experimental overlay driver

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

vdemeester/libnetwork,aboch/libnetwork_new,mavenugo/libnetwork,amitkris/libnetwork,hackersdotmu/libnetwork,medallia/libnetwork,mavenugo/libnetwork,mYmNeo/libnetwork,jimmycmh/libnetwork,vdemeester/libnetwork,mYmNeo/libnetwork,amitkris/libnetwork,msabansal/libnetwork,medallia/libnetwork,msabansal/libnetwork,pyakpyak/libnetwork,anortef/libnetwork,pyakpyak/libnetwork,curtiszimmerman/libnetwork,jmzwcn/libnetwork,kolyshkin/libnetwork,kolyshkin/libnetwork,docker/libnetwork,cpuguy83/libnetwork,aboch/libnetwork_new,allencloud/libnetwork,ityangchen/libnetwork,mahak/libnetwork,tgraf/libnetwork,WeiZhang555/libnetwork,allencloud/libnetwork,mahak/libnetwork,docker/libnetwork,cpuguy83/libnetwork,sainath14/libnetwork,curtiszimmerman/libnetwork,ityangchen/libnetwork,hackersdotmu/libnetwork,mbanikazemi/libnetwork,mbanikazemi/libnetwork,tgraf/libnetwork,sainath14/libnetwork,abhi/libnetwork,tmakita/libnetwork,mahak/libnetwork,abhi/libnetwork,anortef/libnetwork,YujiOshima/libnetwork,medallia/libnetwork,vdemeester/libnetwork,coolljt0725/libnetwork,WeiZhang555/libnetwork,YujiOshima/libnetwork,abhi/libnetwork,fcrisciani/libnetwork,jimmycmh/libnetwork,tmakita/libnetwork,jmzwcn/libnetwork,fcrisciani/libnetwork,kolyshkin/libnetwork,coolljt0725/libnetwork,docker/libnetwork