chef-826: have knife check for a username
chef-826: have knife check for a username

if a user is not provided via -u or in the configfile, the rest call will fail. let the user know.

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