Change config of keystone_authtoken in lib/ironic
Change config of keystone_authtoken in lib/ironic

This commit is temporary work-around until Ironic is fixed(bug#1422632)

The reason of creating temporary work-around is following
Ironic re-uses specific values from the keystone_authtoken middleware.
So we should specify admin_user, admin_password and so on instead of username, password.

Change-Id: If8869e16a167eea0af87afda0eabcbb803627db6
Closes-Bug: #1418341 at devstack

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