Bump up the count of workers for heat
Bump up the count of workers for heat

Looks like the workers is set to 0 which in heat is used
mainly for profiling/debugging and not really useful in
the devstack scenarios.
https://github.com/openstack/heat/blob/master/heat/common/wsgi.py#L286

Partial-Bug: #1412923
Change-Id: Iccf6aeffd461fdc1f78022cbda370be4b9573267

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