providers/docker: better comments
providers/docker: better comments

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