providers/virtualbox: fix missing interpolation [GH-3277]
providers/virtualbox: fix missing interpolation [GH-3277]

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