Add devstack-admin cloud to clouds.yaml
Add devstack-admin cloud to clouds.yaml

A lot of commands developers use require admin by default, so add a
"devstack-admin" cloud to clouds.yaml that has admin authority.

 $ openstack --os-cloud devstack-admin user list

Change-Id: Ie0f1979c50901004418f8622d4ca79dc4bdadd8d

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