providers/docker: get rid of mutex around Docker access, should be safe
providers/docker: get rid of mutex around Docker access, should be safe

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