Launch screen with bash as shell
Launch screen with bash as shell

Since screen commands are bash specifics make sure we launch screen with
bash login shell instead of other shells.

Fixes bug928883.

Change-Id: I62b4c7182682deb4ef16ed0cf1a3b5a130c1c4ee

avvocatodemarchis/devstack,deepakselvaraj/devstack,richliu/devstack,shootstar/devstacktest,TwinkleChawla/devstack,andrewrothstein/devstack,nuxeh/devstack,herrsechs/devstack,bljgaurav/openstack-test,cloudbuilders/devstack,mssumanth/devstack,rushiagr/devstack,ozamiatin/devstack,sequenceiq/devstack,pczerkas/devstack,mmasaki/devstack,ozamiatin/devstack,Mahito/devstack,sc68cal/devstack,inkerra/devstack,bq-xiao/devstack,costingalan/devstack,thomasem/devstack,richliu/devstack,savi-dev/devstack,j4/devstack,JioCloud/devstack,upadhyay-prashant/devstack,herrsechs/devstack,sequenceiq/devstack,prithivm/branch01,bswartz/devstack,dtroyer/devstack,NaokiMiyata/devstack,parul24/devstack,affo/devstack,HPCHub/devstack,innodee/openstackk,noironetworks/devstack,mc2014/devstack,cloudbuilders/devstack,atulpatil301/devstack,CloudServer/devstack,olivierlemasle/devstack,NaokiMiyata/devstack,HPCHub/devstack,pombredanne/devstack,pczerkas/devstack,tianweizhang/devstack,pacinete/devstack,j4/devstack,savi-dev/devstack,vishnugonela/devstack,upadhyay-prashant/devstack,vishnugonela/devstack,mc2014/devstack,bq-xiao/devstack,neerja28/Devstack_GlusterFS,williamthegrey/devstack,r-mibu/devstack,vsham20/devstack,armando-migliaccio/devstack,flavio-fernandes/devstack,BSJAIN92/OpenStack,group-policy/devstack,varunarya10/devstack,nati/devstack_public,costingalan/devstack,pacinete/devstack,CiscoSystems/devstack,citrix-openstack-build/devstack,Yuriy-Leonov/devstack,dirkmueller/devstack,ewindisch/raspi-devstack,Mahito/devstack,bljgaurav/openstack-test,srics/devstack,kplus/devstack-moonshot,ykaneko/devstack,mssumanth/devstack,nati/devstack_public,varunarya10/devstack,avvocatodemarchis/devstack,bigswitch/devstack,promptworks/devstack,liuquansheng47/devstack,ykaneko/devstack,TwinkleChawla/devstack,nttmcl/devstack_public,bswartz/devstack,olivierlemasle/devstack,samgoon/devstack,virtualopensystems/devstack,atulpatil301/devstack,parul24/devstack,thomasem/devstack,samgoon/devstack,dirkmueller/devstack,promptworks/devstack,ewindisch/raspi-devstack,citrix-openstack-build/devstack,dtroyer/devstack,Millnert/contrail-devstack,BSJAIN92/OpenStack,vsham20/devstack,pombredanne/devstack,CloudServer/devstack,eharney/devstack,eshnil2000/devstack,andrewrothstein/devstack,wenhuizhang/devstack,openstack-dev/devstack,bigswitch/devstack,tianweizhang/devstack,prithivm/branch01,mmasaki/devstack,kplus/devstack-moonshot,nttmcl/devstack_public,LoHChina/devstack,LoHChina/devstack,jamielennox/devstack,eharney/devstack,neerja28/Devstack_GlusterFS,noironetworks/devstack,liuquansheng47/devstack,r-mibu/devstack,group-policy/devstack,nawawi/openstack,sstrato/devstack,sc68cal/devstack,yamt/devstack,openstack-dev/devstack,flavio-fernandes/devstack,nuxeh/devstack,nawawi/openstack,rushiagr/devstack,affo/devstack,Juniper/devstack,wenhuizhang/devstack