Revert "changed rescue to ensure block in Busy.busy"
Revert "changed rescue to ensure block in Busy.busy"

Tests ensure that the ensure block within the mutex handles setting busy to false in the case of an exception.

kamigerami/vagrant,cgvarela/vagrant,Ninir/vagrant,TheBigBear/vagrant,invernizzi-at-google/vagrant,petems/vagrant,teotihuacanada/vagrant,jberends/vagrant,benizi/vagrant,pwnall/vagrant,clinstid/vagrant,zsjohny/vagrant,legal90/vagrant,p0deje/vagrant,myrjola/vagrant,tbarrongh/vagrant,webcoyote/vagrant,glensc/vagrant,tjanez/vagrant,aaam/vagrant,crashlytics/vagrant,channui/vagrant,PatOShea/vagrant,TheBigBear/vagrant,dustymabe/vagrant,dharmab/vagrant,shtouff/vagrant,zsjohny/vagrant,gajdaw/vagrant,fnewberg/vagrant,jhoblitt/vagrant,petems/vagrant,loren-osborn/vagrant,carlosefr/vagrant,bmhatfield/vagrant,gajdaw/vagrant,evverx/vagrant,lonniev/vagrant,lukebakken/vagrant,janek-warchol/vagrant,otagi/vagrant,mephaust/vagrant,genome21/vagrant,senglin/vagrant,bheuvel/vagrant,mpoeter/vagrant,jkburges/vagrant,simonsd/vagrant,invernizzi-at-google/vagrant,legal90/vagrant,marxarelli/vagrant,bshurts/vagrant,muhanadra/vagrant,mwrock/vagrant,fnewberg/vagrant,jtopper/vagrant,sni/vagrant,modulexcite/vagrant,sni/vagrant,kamigerami/vagrant,darkn3rd/vagrant,cgvarela/vagrant,msabramo/vagrant,jberends/vagrant,lukebakken/vagrant,mpoeter/vagrant,dharmab/vagrant,PatrickLang/vagrant,webcoyote/vagrant,justincampbell/vagrant,otagi/vagrant,jberends/vagrant,blueyed/vagrant,Endika/vagrant,miguel250/vagrant,rivy/vagrant,muhanadra/vagrant,obnoxxx/vagrant,denisbr/vagrant,ferventcoder/vagrant,mkuzmin/vagrant,denisbr/vagrant,otagi/vagrant,Sgoettschkes/vagrant,kamigerami/vagrant,ianmiell/vagrant,sni/vagrant,mitchellh/vagrant,aaam/vagrant,wkolean/vagrant,crashlytics/vagrant,tomfanning/vagrant,wangfakang/vagrant,mephaust/vagrant,modulexcite/vagrant,Sgoettschkes/vagrant,invernizzi-at-google/vagrant,tbarrongh/vagrant,p0deje/vagrant,tbriggs-curse/vagrant,mwarren/vagrant,rivy/vagrant,krig/vagrant,sferik/vagrant,genome21/vagrant,lonniev/vagrant,mephaust/vagrant,johntron/vagrant,jean/vagrant,sideci-sample/sideci-sample-vagrant,MiLk/vagrant,miguel250/vagrant,myrjola/vagrant,fnewberg/vagrant,johntron/vagrant,zsjohny/vagrant,theist/vagrant,tschortsch/vagrant,channui/vagrant,dhoer/vagrant,tknerr/vagrant,p0deje/vagrant,tknerr/vagrant,mitchellh/vagrant,vamegh/vagrant,samphippen/vagrant,wangfakang/vagrant,Endika/vagrant,gajdaw/vagrant,benizi/vagrant,BlakeMesdag/vagrant,stephancom/vagrant,kamazee/vagrant,sideci-sample/sideci-sample-vagrant,stephancom/vagrant,sax/vagrant,bheuvel/vagrant,iNecas/vagrant,krig/vagrant,bshurts/vagrant,dhoer/vagrant,senglin/vagrant,tjanez/vagrant,TheBigBear/vagrant,johntron/vagrant,samphippen/vagrant,ianmiell/vagrant,genome21/vagrant,tbriggs-curse/vagrant,Chhunlong/vagrant,petems/vagrant,marxarelli/vagrant,Endika/vagrant,gbarberi/vagrant,pwnall/vagrant,apertoso/vagrant,mitchellh/vagrant,sferik/vagrant,krig/vagrant,loren-osborn/vagrant,webcoyote/vagrant,bmhatfield/vagrant,benizi/vagrant,mitchellh/vagrant,Chhunlong/vagrant,signed8bit/vagrant,marxarelli/vagrant,muhanadra/vagrant,apertoso/vagrant,msabramo/vagrant,mkuzmin/vagrant,mwrock/vagrant,fnewberg/vagrant,justincampbell/vagrant,nickryand/vagrant,samphippen/vagrant,msabramo/vagrant,mkuzmin/vagrant,doy/vagrant,philwrenn/vagrant,chrisroberts/vagrant,carlosefr/vagrant,cgvarela/vagrant,samphippen/vagrant,bdwyertech/vagrant,chrisvire/vagrant,crashlytics/vagrant,chrisroberts/vagrant,mpoeter/vagrant,jfchevrette/vagrant,myrjola/vagrant,otagi/vagrant,modulexcite/vagrant,gitebra/vagrant,jean/vagrant,jhoblitt/vagrant,legal90/vagrant,rivy/vagrant,taliesins/vagrant,channui/vagrant,bdwyertech/vagrant,wangfakang/vagrant,chrisroberts/vagrant,Chhunlong/vagrant,teotihuacanada/vagrant,denisbr/vagrant,Avira/vagrant,dustymabe/vagrant,janek-warchol/vagrant,jhoblitt/vagrant,shtouff/vagrant,shtouff/vagrant,benh57/vagrant,jmanero/vagrant,tbarrongh/vagrant,philwrenn/vagrant,taliesins/vagrant,Endika/vagrant,Chhed13/vagrant,janek-warchol/vagrant,benizi/vagrant,signed8bit/vagrant,ArloL/vagrant,jean/vagrant,PatrickLang/vagrant,tomfanning/vagrant,darkn3rd/vagrant,juiceinc/vagrant,loren-osborn/vagrant,blueyed/vagrant,kalabiyau/vagrant,h4ck3rm1k3/vagrant,Avira/vagrant,kamazee/vagrant,mwrock/vagrant,blueyed/vagrant,pwnall/vagrant,webcoyote/vagrant,MiLk/vagrant,Sgoettschkes/vagrant,ferventcoder/vagrant,tschortsch/vagrant,cgvarela/vagrant,PatrickLang/vagrant,obnoxxx/vagrant,dhoer/vagrant,tknerr/vagrant,jean/vagrant,ArloL/vagrant,tbriggs-curse/vagrant,kalabiyau/vagrant,tbarrongh/vagrant,bryson/vagrant,bryson/vagrant,bshurts/vagrant,denisbr/vagrant,chrisvire/vagrant,aaam/vagrant,benh57/vagrant,tschortsch/vagrant,ArloL/vagrant,TheBigBear/vagrant,ianmiell/vagrant,doy/vagrant,dharmab/vagrant,gpkfr/vagrant,gitebra/vagrant,iNecas/vagrant,sax/vagrant,Ninir/vagrant,Chhed13/vagrant,ferventcoder/vagrant,aneeshusa/vagrant,bheuvel/vagrant,chrisvire/vagrant,h4ck3rm1k3/vagrant,brianloveswords/vagrant,bshurts/vagrant,lukebakken/vagrant,obnoxxx/vagrant,sax/vagrant,gitebra/vagrant,pwnall/vagrant,carlosefr/vagrant,jkburges/vagrant,juiceinc/vagrant,vamegh/vagrant,gbarberi/vagrant,dustymabe/vagrant,theist/vagrant,jtopper/vagrant,bryson/vagrant,stephancom/vagrant,jmanero/vagrant,jmanero/vagrant,lonniev/vagrant,Chhed13/vagrant,modulexcite/vagrant,tjanez/vagrant,dharmab/vagrant,vamegh/vagrant,bdwyertech/vagrant,jtopper/vagrant,kalabiyau/vagrant,wkolean/vagrant,jfchevrette/vagrant,Sgoettschkes/vagrant,evverx/vagrant,bmhatfield/vagrant,senglin/vagrant,Avira/vagrant,jfchevrette/vagrant,muhanadra/vagrant,mkuzmin/vagrant,apertoso/vagrant,PatOShea/vagrant,johntron/vagrant,kamazee/vagrant,clinstid/vagrant,aneeshusa/vagrant,teotihuacanada/vagrant,taliesins/vagrant,patrys/vagrant,justincampbell/vagrant,msabramo/vagrant,tschortsch/vagrant,signed8bit/vagrant,signed8bit/vagrant,jhoblitt/vagrant,mpoeter/vagrant,genome21/vagrant,kamigerami/vagrant,darkn3rd/vagrant,ferventcoder/vagrant,janek-warchol/vagrant,evverx/vagrant,mwarren/vagrant,chrisroberts/vagrant,glensc/vagrant,patrys/vagrant,tjanez/vagrant,Avira/vagrant,teotihuacanada/vagrant,miguel250/vagrant,clinstid/vagrant,krig/vagrant,shtouff/vagrant,mwarren/vagrant,PatrickLang/vagrant,justincampbell/vagrant,h4ck3rm1k3/vagrant,PatOShea/vagrant,bheuvel/vagrant,ArloL/vagrant,jmanero/vagrant,aneeshusa/vagrant,philoserf/vagrant,nickryand/vagrant,doy/vagrant,BlakeMesdag/vagrant,loren-osborn/vagrant,apertoso/vagrant,benh57/vagrant,iNecas/vagrant,Ninir/vagrant,kamazee/vagrant,marxarelli/vagrant,gpkfr/vagrant,patrys/vagrant,Chhed13/vagrant,patrys/vagrant,wangfakang/vagrant,bryson/vagrant,lonniev/vagrant,philoserf/vagrant,aneeshusa/vagrant,h4ck3rm1k3/vagrant,Chhunlong/vagrant,doy/vagrant,theist/vagrant,jberends/vagrant,theist/vagrant,jtopper/vagrant,dustymabe/vagrant,gbarberi/vagrant,MiLk/vagrant,sax/vagrant,lukebakken/vagrant,dhoer/vagrant,invernizzi-at-google/vagrant,gbarberi/vagrant,sideci-sample/sideci-sample-vagrant,kalabiyau/vagrant,crashlytics/vagrant,PatOShea/vagrant,stephancom/vagrant,juiceinc/vagrant,BlakeMesdag/vagrant,taliesins/vagrant,philoserf/vagrant,mephaust/vagrant,sni/vagrant,zsjohny/vagrant,jkburges/vagrant,sferik/vagrant,bdwyertech/vagrant,tomfanning/vagrant,mwarren/vagrant,blueyed/vagrant,wkolean/vagrant,juiceinc/vagrant,tknerr/vagrant,gpkfr/vagrant,philwrenn/vagrant,carlosefr/vagrant,jfchevrette/vagrant,philoserf/vagrant,benh57/vagrant,chrisvire/vagrant,darkn3rd/vagrant,nickryand/vagrant,wkolean/vagrant,tomfanning/vagrant,nickryand/vagrant,vamegh/vagrant,jkburges/vagrant,ianmiell/vagrant,philwrenn/vagrant,senglin/vagrant,tbriggs-curse/vagrant,miguel250/vagrant,rivy/vagrant,gpkfr/vagrant,petems/vagrant,mwrock/vagrant,gitebra/vagrant,aaam/vagrant,legal90/vagrant,myrjola/vagrant