CHEF-3254: Set run_context to nil before GC
CHEF-3254: Set run_context to nil before GC

According to Dan the run_context may not be released properly in the GC
so we set it to nil to ensure that happens at the end of a run.

youngjl1/chef,malisettirammurthy/chef,sometimesfood/chef,nsdavidson/chef,erkolson/chef,evan2645/chef,Tensibai/chef,jordane/chef,paulmooring/chef,MsysTechnologiesllc/chef,bahamas10/chef,Igorshp/chef,sysbot/chef,sanditiffin/chef,jaymzh/chef,nicklv/chef,tbunnyman/chef,antonifs/chef,sysbot/chef,smurawski/chef,adamleff/chef,clintoncwolfe/chef,robmul/chef,ckaushik/chef,oclaussen/chef,nsdavidson/chef,juliandunn/chef,h4ck3rm1k3/chef,ducthanh/chef,strangelittlemonkey/chef,gsaslis/chef,erkolson/chef,askl56/chef,josb/chef,sekrett/chef,sempervictus/chef,EasonYi/chef,circleback/chef,chef/chef,brettcave/chef,ShadySQL/chef-merged,grubernaut/chef,mikedodge04/chef,DeWaRs1206/chef,evan2645/chef,acaiafa/chef,ekometti/chef,kaznishi/chef,criteo-forks/chef,juliandunn/chef,gene1wood/chef,permyakovsv/chef,nellshamrell/chef,someara/chef,sanditiffin/chef,lamont-granquist/chef,gsaslis/chef,youngjl1/chef,nguyen-tien-mulodo/chef,tomdoherty/chef,nvwls/chef,mattray/chef,strangelittlemonkey/chef,oclaussen/chef,ChaosCloud/chef,josb/chef,paulmooring/chef,custora/chef,clintoncwolfe/chef,swalberg/chef,Kast0rTr0y/chef,askl56/chef,3dinfluence/chef,ducthanh/chef,jagdeesh109/chef,martinb3/chef,nalingarg2/chef-1,cgvarela/chef,strangelittlemonkey/chef,smurawski/chef,ChaosCloud/chef,higanworks/chef,josb/chef,gsaslis/chef,nvwls/chef,onlyhavecans/chef,jaymzh/chef,permyakovsv/chef,andrewpsp/chef,cmluciano/chef,jonlives/chef,mattray/chef,ranjib/chef,josb/chef,askl56/chef,juliandunn/chef,martinb3/chef,Kast0rTr0y/chef,kamaradclimber/chef,adamleff/chef,ekometti/chef,jagdeesh109/chef,jordane/chef,skmichaelson/chef,sometimesfood/chef,nvwls/chef,BackSlasher/chef,adamleff/chef,ChaosCloud/chef,Ppjet6/chef,ducthanh/chef,circleback/chef,coderanger/chef,aaron-lane/chef,GabKlein/chef-merged,erkolson/chef,juliandunn/chef,docwhat/chef,OpSitters/chef,Tensibai/chef,DeWaRs1206/chef,b002368/chef-repo,jk47/chef,mikedodge04/chef,acaiafa/chef,tbunnyman/chef,AndyBoucher/Chef-Testing,higanworks/chef,sideci-sample/sideci-sample-chef,ckaushik/chef,tbunnyman/chef,MsysTechnologiesllc/chef,SUSE-Cloud/chef,gene1wood/chef,Tensibai/chef,malisettirammurthy/chef,Ppjet6/chef,pburkholder/chef,danielsdeleo/seth,ducthanh/chef,skmichaelson/chef,chef/chef,aaron-lane/chef,zshuo/chef,zuazo-forks/chef,custora/chef,martinisoft/chef,smurawski/chef,youngjl1/chef,karthikrev/chef,jagdeesh109/chef,jmhardison/chef,nguyen-tien-mulodo/chef,mio-g/chef,jmhardison/chef,permyakovsv/chef,brettcave/chef,nicklv/chef,kamaradclimber/chef,joemiller/chef,sanditiffin/chef,ChaosCloud/chef,nicklv/chef,grubernaut/chef,nsdavidson/chef,someara/chef,sideci-sample/sideci-sample-chef,nathwill/chef,zuazo-forks/chef,custora/chef,clintoncwolfe/chef,custora/chef,ekometti/chef,legal90/chef,acaiafa/chef,EasonYi/chef,nellshamrell/chef,ccsplit/chef,patcon/chef,criteo-forks/chef,EasonYi/chef,coderanger/chef,ChaosCloud/chef,ktpan/chef-play,h4ck3rm1k3/chef,swalberg/chef,cmluciano/chef,circleback/chef,gsaslis/chef,ccsplit/chef,MichaelPereira/chef,ShadySQL/chef-merged,kaznishi/chef,criteo-forks/chef,nathwill/chef,h4ck3rm1k3/chef,sempervictus/chef,MsysTechnologiesllc/chef,ShadySQL/chef-merged,nguyen-tien-mulodo/chef,skmichaelson/chef,circleback/chef,jaymzh/chef,mattray/chef,adamleff/chef,brettcave/chef,josb/chef,aspiers/chef,renanvicente/chef,karthikrev/chef,andrewpsp/chef,nathwill/chef,erkolson/chef,cgvarela/chef,clintoncwolfe/chef,webframp/chef,ckaushik/chef,oclaussen/chef,BackSlasher/chef,gene1wood/chef,onlyhavecans/chef,jordane/chef,brettcave/chef,Ppjet6/chef,tomdoherty/chef,jimmymccrory/chef,ckaushik/chef,SUSE-Cloud/chef,Igorshp/chef,erkolson/chef,skmichaelson/chef,nellshamrell/chef,EasonYi/chef,AndyBoucher/Chef-Testing,cgvarela/chef,Tensibai/chef,nvwls/chef,jmhardison/chef,oclaussen/chef,OpSitters/chef,tas50/chef-1,BackSlasher/chef,danielsdeleo/seth,swalberg/chef,mwrock/chef,danielsdeleo/seth,zshuo/chef,mal/chef,ktpan/chef-play,pburkholder/chef,tomdoherty/chef,Kast0rTr0y/chef,nellshamrell/chef,tbriggs-curse/chef,mikefaille/chef,ktpan/chef-play,joemiller/chef,renanvicente/chef,swalberg/chef,docwhat/chef,polamjag/chef,skmichaelson/chef,pburkholder/chef,legal90/chef,polamjag/chef,erkolson/chef,oclaussen/chef,b002368/chef-repo,mio-g/chef,mal/chef,natewalck/chef,ducthanh/chef,ranjib/chef,cachamber/chef,jblaine/chef,joemiller/chef,sysbot/chef,coderanger/chef,youngjl1/chef,3dinfluence/chef,evan2645/chef,polamjag/chef,smurawski/chef,bahamas10/chef,permyakovsv/chef,3dinfluence/chef,strangelittlemonkey/chef,paulmooring/chef,lamont-granquist/chef,robmul/chef,malisettirammurthy/chef,jimmymccrory/chef,malisettirammurthy/chef,jkerry/chef,tas50/chef-1,sometimesfood/chef,nalingarg2/chef-1,mio-g/chef,OpSitters/chef,Ppjet6/chef,martinisoft/chef,nellshamrell/chef,jk47/chef,jmhardison/chef,higanworks/chef,OpSitters/chef,jonlives/chef,legal90/chef,docwhat/chef,zuazo-forks/chef,grubernaut/chef,adamleff/chef,criteo-forks/chef,webframp/chef,BackSlasher/chef,aaron-lane/chef,juliandunn/chef,jmhardison/chef,nguyen-tien-mulodo/chef,mikefaille/chef,oclaussen/chef,sysbot/chef,sometimesfood/chef,ccope/chef,ccsplit/chef,permyakovsv/chef,coderanger/chef,jimmymccrory/chef,gene1wood/chef,askl56/chef,lamont-granquist/chef,Igorshp/chef,mal/chef,nalingarg2/chef-1,jonlives/chef,mattray/chef,jordane/chef,gsaslis/chef,karthikrev/chef,bahamas10/chef,aspiers/chef,jblaine/chef,evan2645/chef,ktpan/chef-play,SUSE-Cloud/chef,ChaosCloud/chef,andrewpsp/chef,sekrett/chef,jkerry/chef,zuazo-forks/chef,smurawski/chef,MsysTechnologiesllc/chef,Tensibai/chef,DeWaRs1206/chef,nsdavidson/chef,BackSlasher/chef,martinb3/chef,ktpan/chef-play,docwhat/chef,andrewpsp/chef,legal90/chef,sometimesfood/chef,pburkholder/chef,mal/chef,antonifs/chef,mikefaille/chef,ccsplit/chef,GabKlein/chef-merged,patcon/chef,SUSE-Cloud/chef,antonifs/chef,polamjag/chef,askl56/chef,danielsdeleo/seth,criteo-forks/chef,nalingarg2/chef-1,Kast0rTr0y/chef,ccope/chef,malisettirammurthy/chef,grubernaut/chef,youngjl1/chef,zuazo-forks/chef,sometimesfood/chef,lamont-granquist/chef,mattray/chef,mwrock/chef,josb/chef,mikedodge04/chef,Igorshp/chef,faspl/chef,natewalck/chef,tbriggs-curse/chef,youngjl1/chef,nalingarg2/chef-1,martinb3/chef,evan2645/chef,sekrett/chef,andrewpsp/chef,jkerry/chef,zshuo/chef,patcon/chef,EasonYi/chef,custora/chef,tbunnyman/chef,kamaradclimber/chef,ShadySQL/chef-merged,strangelittlemonkey/chef,joemiller/chef,ShadySQL/chef-merged,faspl/chef,kaznishi/chef,robmul/chef,faspl/chef,mal/chef,onlyhavecans/chef,sekrett/chef,b002368/chef-repo,mikefaille/chef,Ppjet6/chef,antonifs/chef,jk47/chef,aspiers/chef,baberthal/chef,gsaslis/chef,sempervictus/chef,cachamber/chef,danielsdeleo/seth,b002368/chef-repo,Kast0rTr0y/chef,tas50/chef-1,higanworks/chef,nguyen-tien-mulodo/chef,acaiafa/chef,DeWaRs1206/chef,baberthal/chef,chef/chef,robmul/chef,jk47/chef,sideci-sample/sideci-sample-chef,AndyBoucher/Chef-Testing,paulmooring/chef,jkerry/chef,h4ck3rm1k3/chef,baberthal/chef,webframp/chef,jaymzh/chef,jblaine/chef,legal90/chef,aspiers/chef,ccope/chef,robmul/chef,legal90/chef,renanvicente/chef,MichaelPereira/chef,docwhat/chef,ckaushik/chef,bahamas10/chef,mal/chef,b002368/chef-repo,jk47/chef,natewalck/chef,zshuo/chef,askl56/chef,webframp/chef,jmhardison/chef,ranjib/chef,nvwls/chef,baberthal/chef,karthikrev/chef,patcon/chef,tomdoherty/chef,tbriggs-curse/chef,OpSitters/chef,nicklv/chef,nicklv/chef,someara/chef,robmul/chef,onlyhavecans/chef,acaiafa/chef,b002368/chef-repo,cmluciano/chef,webframp/chef,polamjag/chef,joemiller/chef,paulmooring/chef,jimmymccrory/chef,nalingarg2/chef-1,zshuo/chef,cachamber/chef,baberthal/chef,ranjib/chef,ranjib/chef,3dinfluence/chef,baberthal/chef,sempervictus/chef,karthikrev/chef,martinisoft/chef,grubernaut/chef,renanvicente/chef,nathwill/chef,natewalck/chef,MichaelPereira/chef,mwrock/chef,tbunnyman/chef,ccsplit/chef,sekrett/chef,SUSE-Cloud/chef,3dinfluence/chef,patcon/chef,cgvarela/chef,Kast0rTr0y/chef,kaznishi/chef,jimmymccrory/chef,renanvicente/chef,faspl/chef,skmichaelson/chef,Ppjet6/chef,DeWaRs1206/chef,tbunnyman/chef,mikefaille/chef,sysbot/chef,martinb3/chef,Igorshp/chef,tbriggs-curse/chef,GabKlein/chef-merged,joemiller/chef,tomdoherty/chef,bahamas10/chef,someara/chef,onlyhavecans/chef,kaznishi/chef,mwrock/chef,cachamber/chef,pburkholder/chef,EasonYi/chef,swalberg/chef,h4ck3rm1k3/chef,onlyhavecans/chef,cgvarela/chef,nsdavidson/chef,nathwill/chef,cachamber/chef,aspiers/chef,faspl/chef,permyakovsv/chef,jonlives/chef,cachamber/chef,mikedodge04/chef,andrewpsp/chef,jagdeesh109/chef,nsdavidson/chef,cmluciano/chef,bahamas10/chef,grubernaut/chef,circleback/chef,ekometti/chef,brettcave/chef,martinisoft/chef,swalberg/chef,ccsplit/chef,sanditiffin/chef,polamjag/chef,custora/chef,jblaine/chef,mikedodge04/chef,sekrett/chef,AndyBoucher/Chef-Testing,cmluciano/chef,jonlives/chef,OpSitters/chef,faspl/chef,patcon/chef,mio-g/chef,docwhat/chef,criteo-forks/chef,aaron-lane/chef,mio-g/chef,BackSlasher/chef,paulmooring/chef,higanworks/chef,tbriggs-curse/chef,lamont-granquist/chef,ckaushik/chef,nathwill/chef,clintoncwolfe/chef,jk47/chef,ducthanh/chef,malisettirammurthy/chef,nvwls/chef,adamleff/chef,nellshamrell/chef,jblaine/chef,pburkholder/chef,ekometti/chef,AndyBoucher/Chef-Testing,sanditiffin/chef,sempervictus/chef,natewalck/chef,ekometti/chef,MichaelPereira/chef,nguyen-tien-mulodo/chef,renanvicente/chef,antonifs/chef,jblaine/chef,natewalck/chef,nicklv/chef,someara/chef,tas50/chef-1,MichaelPereira/chef,jordane/chef,sempervictus/chef,3dinfluence/chef,jkerry/chef,ccope/chef,brettcave/chef,sanditiffin/chef,SUSE-Cloud/chef,mikefaille/chef,DeWaRs1206/chef,clintoncwolfe/chef,jagdeesh109/chef,chef/chef,webframp/chef,mio-g/chef,someara/chef,circleback/chef,jimmymccrory/chef,ranjib/chef,martinb3/chef,lamont-granquist/chef,antonifs/chef,AndyBoucher/Chef-Testing,jkerry/chef,cgvarela/chef,ktpan/chef-play,aaron-lane/chef,strangelittlemonkey/chef,h4ck3rm1k3/chef,sideci-sample/sideci-sample-chef,karthikrev/chef,GabKlein/chef-merged,ccope/chef,smurawski/chef,zshuo/chef,acaiafa/chef,jagdeesh109/chef,MichaelPereira/chef,aaron-lane/chef,kamaradclimber/chef,sideci-sample/sideci-sample-chef,mikedodge04/chef,martinisoft/chef,evan2645/chef,tbriggs-curse/chef,kaznishi/chef,jonlives/chef,zuazo-forks/chef,Igorshp/chef