Set tempest lock_path to default in $DATA_DIR
Set tempest lock_path to default in $DATA_DIR

Change I464edf9e11710e1931ed4f7b0262328a57e5b3de set the tempest
lock_path to be $TMPDIR, however when run in the gate this is an
empty string which results in all tests that use locking failing.
This commit corrects that by setting the lock_path config variable
to use $TEMPEST_STATE_PATH which defaults to $DATA_DIR/tempest.

Change-Id: I02fbd50ca68d6daafb5b4c23579473eb703ae72a

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