Add response time to keystone access log
Add response time to keystone access log

Add the response time to keystone's access log for each request. This
will be the last element in the log-line and will be represented in
microseconds.

Change-Id: I19204369af5cdf06df2237550c350dfb3ffc995d

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