fix dirname call in impala-config for zsh
fix dirname call in impala-config for zsh

lnliuxing/Impala,XiaominZhang/Impala,ibmsoe/ImpalaPPC,placrosse/ImpalaToGo,XiaominZhang/Impala,XiaominZhang/Impala,placrosse/ImpalaToGo,bowlofstew/Impala,rdblue/Impala,cgvarela/Impala,cchanning/Impala,cloudera/recordservice,ibmsoe/ImpalaPPC,rampage644/impala-cut,lirui-intel/Impala,tempbottle/Impala,cgvarela/Impala,bratatidas9/Impala-1,kapilrastogi/Impala,rdblue/Impala,cchanning/Impala,ImpalaToGo/ImpalaToGo,andybab/Impala,ibmsoe/ImpalaPPC,caseyching/Impala,tempbottle/Impala,grundprinzip/Impala,scalingdata/Impala,andybab/Impala,lnliuxing/Impala,rampage644/impala-cut,lirui-intel/Impala,cchanning/Impala,cloudera/recordservice,caseyching/Impala,rdblue/Impala,theyaa/Impala,kapilrastogi/Impala,grundprinzip/Impala,ibmsoe/ImpalaPPC,bratatidas9/Impala-1,rampage644/impala-cut,grundprinzip/Impala,brightchen/Impala,lirui-intel/Impala,lnliuxing/Impala,gerashegalov/Impala,caseyching/Impala,cchanning/Impala,placrosse/ImpalaToGo,gistic/PublicSpatialImpala,brightchen/Impala,ibmsoe/ImpalaPPC,henryr/Impala,bowlofstew/Impala,gistic/PublicSpatialImpala,scalingdata/Impala,tempbottle/Impala,placrosse/ImpalaToGo,cchanning/Impala,lnliuxing/Impala,andybab/Impala,lirui-intel/Impala,tempbottle/Impala,theyaa/Impala,henryr/Impala,lnliuxing/Impala,cgvarela/Impala,cgvarela/Impala,caseyching/Impala,mapr/impala,mapr/impala,tempbottle/Impala,cloudera/recordservice,theyaa/Impala,bowlofstew/Impala,theyaa/Impala,bratatidas9/Impala-1,rdblue/Impala,cloudera/recordservice,cloudera/recordservice,kapilrastogi/Impala,lirui-intel/Impala,gerashegalov/Impala,rampage644/impala-cut,AtScaleInc/Impala,cchanning/Impala,mapr/impala,ibmsoe/ImpalaPPC,ImpalaToGo/ImpalaToGo,gerashegalov/Impala,caseyching/Impala,henryr/Impala,cloudera/recordservice,gistic/PublicSpatialImpala,rdblue/Impala,cloudera/recordservice,AtScaleInc/Impala,AtScaleInc/Impala,mapr/impala,scalingdata/Impala,bratatidas9/Impala-1,kapilrastogi/Impala,ImpalaToGo/ImpalaToGo,bowlofstew/Impala,rampage644/impala-cut,rdblue/Impala,gistic/PublicSpatialImpala,AtScaleInc/Impala,caseyching/Impala,tempbottle/Impala,theyaa/Impala,henryr/Impala,kapilrastogi/Impala,brightchen/Impala,scalingdata/Impala,XiaominZhang/Impala,theyaa/Impala,lnliuxing/Impala,scalingdata/Impala,bratatidas9/Impala-1,gistic/PublicSpatialImpala,caseyching/Impala,gerashegalov/Impala,henryr/Impala,ImpalaToGo/ImpalaToGo,ImpalaToGo/ImpalaToGo,henryr/Impala,AtScaleInc/Impala,ibmsoe/ImpalaPPC,lirui-intel/Impala,kapilrastogi/Impala,gerashegalov/Impala,cgvarela/Impala,andybab/Impala,rdblue/Impala,placrosse/ImpalaToGo,bowlofstew/Impala,brightchen/Impala,placrosse/ImpalaToGo,bratatidas9/Impala-1,ImpalaToGo/ImpalaToGo,andybab/Impala,cgvarela/Impala,XiaominZhang/Impala,bowlofstew/Impala,cchanning/Impala,grundprinzip/Impala,lirui-intel/Impala,andybab/Impala,tempbottle/Impala,lnliuxing/Impala,XiaominZhang/Impala,brightchen/Impala,gistic/PublicSpatialImpala,grundprinzip/Impala,kapilrastogi/Impala,cgvarela/Impala,scalingdata/Impala,brightchen/Impala,theyaa/Impala,gerashegalov/Impala,XiaominZhang/Impala,mapr/impala,gerashegalov/Impala,rampage644/impala-cut,AtScaleInc/Impala,bowlofstew/Impala,bratatidas9/Impala-1,grundprinzip/Impala,brightchen/Impala