providers/docker: Handle forwarded port collisions
providers/docker: Handle forwarded port collisions

jfchevrette/vagrant,shtouff/vagrant,loren-osborn/vagrant,mwrock/vagrant,stephancom/vagrant,gbarberi/vagrant,blueyed/vagrant,kalabiyau/vagrant,benh57/vagrant,janek-warchol/vagrant,gitebra/vagrant,tschortsch/vagrant,jkburges/vagrant,tomfanning/vagrant,TheBigBear/vagrant,Endika/vagrant,chrisvire/vagrant,krig/vagrant,sni/vagrant,sax/vagrant,rivy/vagrant,jean/vagrant,marxarelli/vagrant,shtouff/vagrant,fnewberg/vagrant,mkuzmin/vagrant,obnoxxx/vagrant,loren-osborn/vagrant,dhoer/vagrant,kamazee/vagrant,chrisroberts/vagrant,vamegh/vagrant,wkolean/vagrant,fnewberg/vagrant,TheBigBear/vagrant,blueyed/vagrant,jkburges/vagrant,vamegh/vagrant,lonniev/vagrant,gitebra/vagrant,wkolean/vagrant,bheuvel/vagrant,cgvarela/vagrant,bheuvel/vagrant,bdwyertech/vagrant,wangfakang/vagrant,dhoer/vagrant,sni/vagrant,doy/vagrant,marxarelli/vagrant,wangfakang/vagrant,philwrenn/vagrant,Chhunlong/vagrant,muhanadra/vagrant,otagi/vagrant,johntron/vagrant,teotihuacanada/vagrant,wangfakang/vagrant,miguel250/vagrant,ianmiell/vagrant,MiLk/vagrant,denisbr/vagrant,nickryand/vagrant,jberends/vagrant,philwrenn/vagrant,petems/vagrant,gajdaw/vagrant,crashlytics/vagrant,patrys/vagrant,gpkfr/vagrant,jhoblitt/vagrant,Avira/vagrant,bshurts/vagrant,h4ck3rm1k3/vagrant,ianmiell/vagrant,kalabiyau/vagrant,bryson/vagrant,lonniev/vagrant,ArloL/vagrant,gitebra/vagrant,aaam/vagrant,pwnall/vagrant,jhoblitt/vagrant,kamigerami/vagrant,mkuzmin/vagrant,taliesins/vagrant,wangfakang/vagrant,zsjohny/vagrant,genome21/vagrant,chrisroberts/vagrant,teotihuacanada/vagrant,lonniev/vagrant,tbarrongh/vagrant,legal90/vagrant,Avira/vagrant,janek-warchol/vagrant,mitchellh/vagrant,benizi/vagrant,mpoeter/vagrant,tbriggs-curse/vagrant,sax/vagrant,shtouff/vagrant,carlosefr/vagrant,otagi/vagrant,lukebakken/vagrant,nickryand/vagrant,chrisvire/vagrant,mitchellh/vagrant,dharmab/vagrant,theist/vagrant,mpoeter/vagrant,Chhed13/vagrant,tknerr/vagrant,clinstid/vagrant,kalabiyau/vagrant,senglin/vagrant,jtopper/vagrant,mwarren/vagrant,mwrock/vagrant,tknerr/vagrant,Endika/vagrant,wkolean/vagrant,dhoer/vagrant,bryson/vagrant,genome21/vagrant,BlakeMesdag/vagrant,patrys/vagrant,rivy/vagrant,blueyed/vagrant,philwrenn/vagrant,PatrickLang/vagrant,bshurts/vagrant,aneeshusa/vagrant,petems/vagrant,lonniev/vagrant,PatOShea/vagrant,marxarelli/vagrant,juiceinc/vagrant,philoserf/vagrant,obnoxxx/vagrant,jkburges/vagrant,h4ck3rm1k3/vagrant,theist/vagrant,channui/vagrant,senglin/vagrant,fnewberg/vagrant,Avira/vagrant,ferventcoder/vagrant,gajdaw/vagrant,ferventcoder/vagrant,bdwyertech/vagrant,aaam/vagrant,dhoer/vagrant,sideci-sample/sideci-sample-vagrant,bshurts/vagrant,jkburges/vagrant,Sgoettschkes/vagrant,johntron/vagrant,johntron/vagrant,jmanero/vagrant,myrjola/vagrant,modulexcite/vagrant,darkn3rd/vagrant,muhanadra/vagrant,mpoeter/vagrant,jberends/vagrant,legal90/vagrant,kamigerami/vagrant,invernizzi-at-google/vagrant,krig/vagrant,apertoso/vagrant,clinstid/vagrant,loren-osborn/vagrant,bdwyertech/vagrant,apertoso/vagrant,denisbr/vagrant,mwrock/vagrant,chrisroberts/vagrant,invernizzi-at-google/vagrant,signed8bit/vagrant,stephancom/vagrant,pwnall/vagrant,wkolean/vagrant,signed8bit/vagrant,zsjohny/vagrant,crashlytics/vagrant,lukebakken/vagrant,aaam/vagrant,jmanero/vagrant,denisbr/vagrant,kamazee/vagrant,doy/vagrant,sax/vagrant,modulexcite/vagrant,pwnall/vagrant,dharmab/vagrant,petems/vagrant,taliesins/vagrant,jfchevrette/vagrant,loren-osborn/vagrant,chrisroberts/vagrant,Chhunlong/vagrant,rivy/vagrant,gbarberi/vagrant,nickryand/vagrant,tbriggs-curse/vagrant,gajdaw/vagrant,myrjola/vagrant,evverx/vagrant,mwarren/vagrant,chrisvire/vagrant,pwnall/vagrant,doy/vagrant,tbriggs-curse/vagrant,Avira/vagrant,tomfanning/vagrant,sideci-sample/sideci-sample-vagrant,invernizzi-at-google/vagrant,cgvarela/vagrant,gpkfr/vagrant,genome21/vagrant,philoserf/vagrant,ianmiell/vagrant,theist/vagrant,tschortsch/vagrant,kalabiyau/vagrant,signed8bit/vagrant,stephancom/vagrant,bryson/vagrant,crashlytics/vagrant,juiceinc/vagrant,dustymabe/vagrant,janek-warchol/vagrant,Sgoettschkes/vagrant,jberends/vagrant,jberends/vagrant,miguel250/vagrant,kamazee/vagrant,carlosefr/vagrant,jhoblitt/vagrant,iNecas/vagrant,h4ck3rm1k3/vagrant,dustymabe/vagrant,sax/vagrant,dharmab/vagrant,PatOShea/vagrant,chrisvire/vagrant,PatrickLang/vagrant,mitchellh/vagrant,MiLk/vagrant,benh57/vagrant,carlosefr/vagrant,theist/vagrant,crashlytics/vagrant,darkn3rd/vagrant,channui/vagrant,benh57/vagrant,PatrickLang/vagrant,Sgoettschkes/vagrant,taliesins/vagrant,mkuzmin/vagrant,juiceinc/vagrant,philoserf/vagrant,miguel250/vagrant,justincampbell/vagrant,zsjohny/vagrant,apertoso/vagrant,otagi/vagrant,darkn3rd/vagrant,krig/vagrant,sni/vagrant,lukebakken/vagrant,tjanez/vagrant,evverx/vagrant,invernizzi-at-google/vagrant,h4ck3rm1k3/vagrant,BlakeMesdag/vagrant,jean/vagrant,ArloL/vagrant,denisbr/vagrant,tbarrongh/vagrant,bshurts/vagrant,benizi/vagrant,legal90/vagrant,TheBigBear/vagrant,iNecas/vagrant,evverx/vagrant,zsjohny/vagrant,modulexcite/vagrant,teotihuacanada/vagrant,mwarren/vagrant,Endika/vagrant,nickryand/vagrant,muhanadra/vagrant,janek-warchol/vagrant,bryson/vagrant,tjanez/vagrant,jtopper/vagrant,justincampbell/vagrant,ferventcoder/vagrant,mwarren/vagrant,justincampbell/vagrant,PatrickLang/vagrant,taliesins/vagrant,gbarberi/vagrant,tjanez/vagrant,clinstid/vagrant,ianmiell/vagrant,modulexcite/vagrant,kamazee/vagrant,gpkfr/vagrant,iNecas/vagrant,cgvarela/vagrant,patrys/vagrant,jmanero/vagrant,patrys/vagrant,genome21/vagrant,shtouff/vagrant,benizi/vagrant,doy/vagrant,aneeshusa/vagrant,ArloL/vagrant,mitchellh/vagrant,MiLk/vagrant,obnoxxx/vagrant,mkuzmin/vagrant,ArloL/vagrant,sni/vagrant,myrjola/vagrant,otagi/vagrant,benh57/vagrant,kamigerami/vagrant,jtopper/vagrant,legal90/vagrant,krig/vagrant,tbriggs-curse/vagrant,dustymabe/vagrant,jean/vagrant,teotihuacanada/vagrant,jhoblitt/vagrant,rivy/vagrant,sideci-sample/sideci-sample-vagrant,aneeshusa/vagrant,lukebakken/vagrant,aaam/vagrant,tknerr/vagrant,gitebra/vagrant,philoserf/vagrant,benizi/vagrant,tbarrongh/vagrant,darkn3rd/vagrant,Chhed13/vagrant,channui/vagrant,TheBigBear/vagrant,kamigerami/vagrant,senglin/vagrant,jtopper/vagrant,juiceinc/vagrant,PatOShea/vagrant,petems/vagrant,Sgoettschkes/vagrant,bdwyertech/vagrant,johntron/vagrant,Chhed13/vagrant,mpoeter/vagrant,bheuvel/vagrant,tjanez/vagrant,stephancom/vagrant,aneeshusa/vagrant,vamegh/vagrant,ferventcoder/vagrant,justincampbell/vagrant,Chhed13/vagrant,jmanero/vagrant,PatOShea/vagrant,miguel250/vagrant,carlosefr/vagrant,myrjola/vagrant,muhanadra/vagrant,tschortsch/vagrant,dharmab/vagrant,tomfanning/vagrant,blueyed/vagrant,tbarrongh/vagrant,fnewberg/vagrant,marxarelli/vagrant,vamegh/vagrant,signed8bit/vagrant,tknerr/vagrant,mwrock/vagrant,tschortsch/vagrant,Endika/vagrant,gbarberi/vagrant,apertoso/vagrant,dustymabe/vagrant,gpkfr/vagrant,cgvarela/vagrant,Chhunlong/vagrant,philwrenn/vagrant,jfchevrette/vagrant,BlakeMesdag/vagrant,jfchevrette/vagrant,jean/vagrant,Chhunlong/vagrant,bheuvel/vagrant,senglin/vagrant,tomfanning/vagrant