providers/docker: don't remove image on reload for build cache
providers/docker: don't remove image on reload for build cache

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