CDH-22322: impala-shell script should set PYTHON_EGG_CACHE
CDH-22322: impala-shell script should set PYTHON_EGG_CACHE

This patch sets the impala-shell's PYTHON_EGG_CACHE to a per-user temporary location. Not
doing this can sometimes lead to permission issues.

Change-Id: I6dda335e3b2a91b4d471f8794bed8c351d90c9ae
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5311
Reviewed-by: Ishaan Joshi <d1d1e60202ec9f2503deb1b724986485a125d802@cloudera.com>
Tested-by: jenkins

henryr/Impala,bowlofstew/Impala,lirui-intel/Impala,caseyching/Impala,kapilrastogi/Impala,theyaa/Impala,theyaa/Impala,XiaominZhang/Impala,ImpalaToGo/ImpalaToGo,cgvarela/Impala,bratatidas9/Impala-1,gerashegalov/Impala,bratatidas9/Impala-1,caseyching/Impala,grundprinzip/Impala,placrosse/ImpalaToGo,XiaominZhang/Impala,lirui-intel/Impala,placrosse/ImpalaToGo,gerashegalov/Impala,ImpalaToGo/ImpalaToGo,cloudera/recordservice,lirui-intel/Impala,scalingdata/Impala,placrosse/ImpalaToGo,henryr/Impala,lirui-intel/Impala,bratatidas9/Impala-1,brightchen/Impala,caseyching/Impala,gerashegalov/Impala,henryr/Impala,kapilrastogi/Impala,brightchen/Impala,rdblue/Impala,cgvarela/Impala,scalingdata/Impala,ImpalaToGo/ImpalaToGo,kapilrastogi/Impala,scalingdata/Impala,tempbottle/Impala,rdblue/Impala,grundprinzip/Impala,XiaominZhang/Impala,grundprinzip/Impala,cloudera/recordservice,theyaa/Impala,bowlofstew/Impala,scalingdata/Impala,lnliuxing/Impala,grundprinzip/Impala,cchanning/Impala,bratatidas9/Impala-1,tempbottle/Impala,XiaominZhang/Impala,cchanning/Impala,gerashegalov/Impala,cgvarela/Impala,gerashegalov/Impala,cchanning/Impala,ImpalaToGo/ImpalaToGo,brightchen/Impala,bratatidas9/Impala-1,cgvarela/Impala,XiaominZhang/Impala,caseyching/Impala,cloudera/recordservice,brightchen/Impala,scalingdata/Impala,gerashegalov/Impala,kapilrastogi/Impala,cloudera/recordservice,cchanning/Impala,theyaa/Impala,tempbottle/Impala,grundprinzip/Impala,caseyching/Impala,cloudera/recordservice,kapilrastogi/Impala,kapilrastogi/Impala,bratatidas9/Impala-1,cgvarela/Impala,theyaa/Impala,lirui-intel/Impala,tempbottle/Impala,bowlofstew/Impala,brightchen/Impala,brightchen/Impala,kapilrastogi/Impala,henryr/Impala,cloudera/recordservice,rdblue/Impala,ImpalaToGo/ImpalaToGo,bowlofstew/Impala,placrosse/ImpalaToGo,gerashegalov/Impala,lnliuxing/Impala,henryr/Impala,scalingdata/Impala,bowlofstew/Impala,lnliuxing/Impala,rdblue/Impala,tempbottle/Impala,bowlofstew/Impala,lnliuxing/Impala,henryr/Impala,cgvarela/Impala,lirui-intel/Impala,cchanning/Impala,bowlofstew/Impala,bratatidas9/Impala-1,lnliuxing/Impala,rdblue/Impala,tempbottle/Impala,lnliuxing/Impala,placrosse/ImpalaToGo,cloudera/recordservice,rdblue/Impala,caseyching/Impala,XiaominZhang/Impala,cchanning/Impala,lirui-intel/Impala,theyaa/Impala,placrosse/ImpalaToGo,lnliuxing/Impala,rdblue/Impala,XiaominZhang/Impala,cgvarela/Impala,caseyching/Impala,theyaa/Impala,tempbottle/Impala,grundprinzip/Impala,brightchen/Impala,ImpalaToGo/ImpalaToGo,cchanning/Impala