NSX: remove req_timeout as it's not longer used
NSX: remove req_timeout as it's not longer used

This patch removes req_timeout from devstack as it's no longer used.
This was removed from neutron here:
    Id7244cd4d9316931f4f7df1c3b41b3a894f2909a

Change-Id: Ife901479605323e32f24e11266a232fddbd6bdca

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