Append command to screenrc after we update it
Append command to screenrc after we update it

If a group is specified we modify the command to run under "sg".  This
currently isn't reflected in screenrc so rejoining fails

Change-Id: I5c18ba664a6ae9ba9aaa4439a9086bc85085cd75
Closes-Bug: #1444267

vsham20/devstack,olivierlemasle/devstack,noironetworks/devstack,j4/devstack,thomasem/devstack,dtroyer/devstack,pacinete/devstack,andrewrothstein/devstack,vsham20/devstack,avvocatodemarchis/devstack,openstack-dev/devstack,varunarya10/devstack,vishnugonela/devstack,rushiagr/devstack,group-policy/devstack,samgoon/devstack,atulpatil301/devstack,group-policy/devstack,nawawi/openstack,dirkmueller/devstack,bq-xiao/devstack,bljgaurav/openstack-test,pczerkas/devstack,neerja28/Devstack_GlusterFS,andrewrothstein/devstack,herrsechs/devstack,mmasaki/devstack,NaokiMiyata/devstack,CloudServer/devstack,mmasaki/devstack,richliu/devstack,prithivm/branch01,atulpatil301/devstack,mc2014/devstack,nawawi/openstack,pczerkas/devstack,Mahito/devstack,HPCHub/devstack,upadhyay-prashant/devstack,CloudServer/devstack,liuquansheng47/devstack,dtroyer/devstack,dirkmueller/devstack,TwinkleChawla/devstack,bswartz/devstack,bljgaurav/openstack-test,j4/devstack,bswartz/devstack,rushiagr/devstack,herrsechs/devstack,liuquansheng47/devstack,bq-xiao/devstack,pombredanne/devstack,HPCHub/devstack,flavio-fernandes/devstack,pacinete/devstack,mc2014/devstack,richliu/devstack,parul24/devstack,vishnugonela/devstack,wenhuizhang/devstack,neerja28/Devstack_GlusterFS,NaokiMiyata/devstack,LoHChina/devstack,parul24/devstack,noironetworks/devstack,LoHChina/devstack,bigswitch/devstack,upadhyay-prashant/devstack,TwinkleChawla/devstack,costingalan/devstack,wenhuizhang/devstack,prithivm/branch01,costingalan/devstack,flavio-fernandes/devstack,eharney/devstack,ozamiatin/devstack,avvocatodemarchis/devstack,mssumanth/devstack,pombredanne/devstack,openstack-dev/devstack,olivierlemasle/devstack,varunarya10/devstack,thomasem/devstack,eharney/devstack,bigswitch/devstack,samgoon/devstack,ozamiatin/devstack,mssumanth/devstack,Mahito/devstack