Added more test coverage for portmapper package.
Added more test coverage for portmapper package.

Signed-off-by: Madhu Venugopal <d22477479bbf55ba62bd822f4112c80f292c7805@docker.com>

calavera/libnetwork,mapuri/libnetwork,WeiZhang555/libnetwork,junxu/libnetwork,mavenugo/libnetwork,tgraf/libnetwork,dcbw/libnetwork,runcom/libnetwork,jvinod/libnetwork,anarcher/libnetwork,kvasdopil/libnetwork,aboch/libnetwork_new,wcwxyz/libnetwork,jvinod/libnetwork,LK4D4/libnetwork,sainath14/libnetwork,carlye566/libnetwork,kunalkushwaha/libnetwork,msagheer/libnetwork,argvader/libnetwork,minhoryang/libnetwork,cloudflare/libnetwork,fcrisciani/libnetwork,minhoryang/libnetwork,aboch/libnetwork_new,abhi/libnetwork,docker/libnetwork,mYmNeo/libnetwork,mountkin/libnetwork,djones-skytap/libnetwork,calavera/libnetwork,hackersdotmu/libnetwork,Microsoft/libnetwork,kvasdopil/libnetwork,cpuguy83/libnetwork,WeiZhang555/libnetwork,vdemeester/libnetwork,frntn/libnetwork,hw-qiaolei/libnetwork,tgraf/libnetwork,docker/libnetwork,coolljt0725/libnetwork,tmakita/libnetwork,vdemeester/libnetwork,squaremo/libnetwork,amitkris/libnetwork,tangkun75/libnetwork,carlye566/libnetwork_eric,carlye566/libnetwork,AdoHe/libnetwork,anshulr/libnetwork,anortef/libnetwork,brahmaroutu/libnetwork,clnperez/libnetwork,brewertribe/libnetwork,ycaihua/libnetwork,mapuri/libnetwork,mountkin/libnetwork,chenchun/libnetwork,coolljt0725/libnetwork,tangkun75/libnetwork,sanimej/libnetwork,AdoHe/libnetwork,ycaihua/libnetwork,abhi/libnetwork,wulonghui/libnetwork,mYmNeo/libnetwork,fcrisciani/libnetwork,jmzwcn/libnetwork,cpuguy83/libnetwork,abronan/libnetwork,mbanikazemi/libnetwork,brahmaroutu/libnetwork,argvader/libnetwork,vijayendrabvs/libnetwork,sanimej/libnetwork,kolyshkin/libnetwork,msagheer/libnetwork,pyakpyak/libnetwork,bprashanth/libnetwork,wcwxyz/libnetwork,mahak/libnetwork,bprashanth/libnetwork,Microsoft/libnetwork,msabansal/libnetwork,amitkris/libnetwork,boucher/libnetwork,mahak/libnetwork,chenchun/libnetwork,jimmycmh/libnetwork,curtiszimmerman/libnetwork,djones-skytap/libnetwork,YujiOshima/libnetwork,anarcher/libnetwork,sainath14/libnetwork,brewertribe/libnetwork,junxu/libnetwork,hw-qiaolei/libnetwork,dcbw/libnetwork,carlye566/libnetwork_eric,rogaha/libnetwork,boucher/libnetwork,hackersdotmu/libnetwork,mbanikazemi/libnetwork,medallia/libnetwork,kunalkushwaha/libnetwork,msabansal/libnetwork,jmzwcn/libnetwork,sharmasushant/libnetwork,vdemeester/libnetwork,curtiszimmerman/libnetwork,mavenugo/libnetwork,axsh/libnetwork,wulonghui/libnetwork,sharmasushant/libnetwork,medallia/libnetwork,anortef/libnetwork,thockin/libnetwork,LK4D4/libnetwork,squaremo/libnetwork,ityangchen/libnetwork,docker/libnetwork,ityangchen/libnetwork,frntn/libnetwork,lindenlab/libnetwork,allencloud/libnetwork,jimmycmh/libnetwork,pyakpyak/libnetwork,kolyshkin/libnetwork,mahak/libnetwork,thockin/libnetwork,allencloud/libnetwork,abhi/libnetwork,cloudflare/libnetwork,abronan/libnetwork,lindenlab/libnetwork,anshulr/libnetwork,tmakita/libnetwork,axsh/libnetwork,YujiOshima/libnetwork,vijayendrabvs/libnetwork,medallia/libnetwork,kolyshkin/libnetwork,clnperez/libnetwork,runcom/libnetwork,rogaha/libnetwork