add a simple run_tests.sh to use bash8
add a simple run_tests.sh to use bash8

this gives a simple way to run against all the files that we'd
want to check with bash8. Currently clocking in at 300+ errors
(no false pos so far that I see).

Change-Id: Idd83b0bf61029b49bb28ad8b6e6261ecbf927555

CloudServer/devstack,Mahito/devstack,nuxeh/devstack,mmasaki/devstack,avvocatodemarchis/devstack,upadhyay-prashant/devstack,prithivm/branch01,openstack-dev/devstack,bswartz/devstack,promptworks/devstack,tianweizhang/devstack,BSJAIN92/OpenStack,eshnil2000/devstack,dtroyer/devstack,atulpatil301/devstack,vishnugonela/devstack,group-policy/devstack,jamielennox/devstack,dtroyer/devstack,pacinete/devstack,virtualopensystems/devstack,liuquansheng47/devstack,noironetworks/devstack,CloudServer/devstack,atulpatil301/devstack,bigswitch/devstack,upadhyay-prashant/devstack,yamt/devstack,pacinete/devstack,neerja28/Devstack_GlusterFS,HPCHub/devstack,andrewrothstein/devstack,mssumanth/devstack,LoHChina/devstack,wenhuizhang/devstack,affo/devstack,LoHChina/devstack,tianweizhang/devstack,pombredanne/devstack,kplus/devstack-moonshot,kplus/devstack-moonshot,j4/devstack,flavio-fernandes/devstack,mssumanth/devstack,sc68cal/devstack,dirkmueller/devstack,thomasem/devstack,liuquansheng47/devstack,sequenceiq/devstack,thomasem/devstack,williamthegrey/devstack,bswartz/devstack,ozamiatin/devstack,parul24/devstack,pczerkas/devstack,nawawi/openstack,vsham20/devstack,TwinkleChawla/devstack,herrsechs/devstack,costingalan/devstack,bljgaurav/openstack-test,Juniper/devstack,affo/devstack,vsham20/devstack,mc2014/devstack,group-policy/devstack,dirkmueller/devstack,nuxeh/devstack,j4/devstack,mc2014/devstack,andrewrothstein/devstack,bq-xiao/devstack,promptworks/devstack,ozamiatin/devstack,wenhuizhang/devstack,HPCHub/devstack,NaokiMiyata/devstack,parul24/devstack,pombredanne/devstack,richliu/devstack,olivierlemasle/devstack,bq-xiao/devstack,sc68cal/devstack,varunarya10/devstack,olivierlemasle/devstack,Mahito/devstack,eharney/devstack,neerja28/Devstack_GlusterFS,bigswitch/devstack,innodee/openstackk,prithivm/branch01,vishnugonela/devstack,varunarya10/devstack,bljgaurav/openstack-test,sequenceiq/devstack,samgoon/devstack,NaokiMiyata/devstack,nawawi/openstack,richliu/devstack,BSJAIN92/OpenStack,avvocatodemarchis/devstack,TwinkleChawla/devstack,JioCloud/devstack,mmasaki/devstack,pczerkas/devstack,rushiagr/devstack,noironetworks/devstack,openstack-dev/devstack,costingalan/devstack,samgoon/devstack,herrsechs/devstack,rushiagr/devstack,Millnert/contrail-devstack,srics/devstack,eharney/devstack,flavio-fernandes/devstack