Remove lib/tempest errexit handling
Remove lib/tempest errexit handling

lib/tempest had code to set -o errexit and restore the setting after
configure_tempest had run. This code didn't work, but it is no longer
necessary since we set errexit for all of devstack (see change 88521;
Change-Id Ia477e04567046a7fcdedf699423165bc577b72ad).

This changeset removes the errexit handling code from lib/tempest.

Change-Id: I2b0bc3c55a5d9bbb688f1e2e8e0fe133830a4172

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