remove the useless get netns code in createNetworkNamespace
remove the useless get netns code in createNetworkNamespace

Signed-off-by: Shijiang Wei <d51735f6fb3b158a0436903895ceec01381bfb9f@gmail.com>

pyakpyak/libnetwork,sharmasushant/libnetwork,mavenugo/libnetwork,mYmNeo/libnetwork,hackersdotmu/libnetwork,docker/libnetwork,amitkris/libnetwork,kolyshkin/libnetwork,mbanikazemi/libnetwork,tgraf/libnetwork,jimmycmh/libnetwork,YujiOshima/libnetwork,medallia/libnetwork,curtiszimmerman/libnetwork,AdoHe/libnetwork,vdemeester/libnetwork,mahak/libnetwork,tmakita/libnetwork,mahak/libnetwork,jimmycmh/libnetwork,abhi/libnetwork,allencloud/libnetwork,jmzwcn/libnetwork,curtiszimmerman/libnetwork,aboch/libnetwork_new,sanimej/libnetwork,kunalkushwaha/libnetwork,sainath14/libnetwork,medallia/libnetwork,mavenugo/libnetwork,kunalkushwaha/libnetwork,jmzwcn/libnetwork,ityangchen/libnetwork,kolyshkin/libnetwork,AdoHe/libnetwork,sharmasushant/libnetwork,frntn/libnetwork,abhi/libnetwork,runcom/libnetwork,tmakita/libnetwork,medallia/libnetwork,junxu/libnetwork,WeiZhang555/libnetwork,amitkris/libnetwork,mbanikazemi/libnetwork,docker/libnetwork,anortef/libnetwork,hackersdotmu/libnetwork,mYmNeo/libnetwork,allencloud/libnetwork,runcom/libnetwork,tgraf/libnetwork,mapuri/libnetwork,pyakpyak/libnetwork,abhi/libnetwork,sanimej/libnetwork,frntn/libnetwork,coolljt0725/libnetwork,YujiOshima/libnetwork,WeiZhang555/libnetwork,mahak/libnetwork,lindenlab/libnetwork,fcrisciani/libnetwork,docker/libnetwork,sainath14/libnetwork,junxu/libnetwork,mapuri/libnetwork,aboch/libnetwork_new,msabansal/libnetwork,msabansal/libnetwork,anortef/libnetwork,lindenlab/libnetwork,coolljt0725/libnetwork,vdemeester/libnetwork,ityangchen/libnetwork,fcrisciani/libnetwork,vdemeester/libnetwork,cpuguy83/libnetwork,kolyshkin/libnetwork,cpuguy83/libnetwork