Fix host/port split code in authenticate_ec2. Resolves an AttributeError: 'Ec2Credentials' object has no attribute 'partition' exception that can occur for EC2 auth validations.
Fix host/port split code in authenticate_ec2. Resolves an
AttributeError: 'Ec2Credentials' object has no attribute 'partition'
exception that can occur for EC2 auth validations.

Change-Id: Ib361c2cd56eb96011c9209ab24837bbab11b2dd3

admiyo/keystone,promptworks/keystone,townbull/keystone-dtrust,MaheshIBM/keystone,mahak/keystone,ging/keystone,jumpstarter-io/keystone,rushiagr/keystone,reeshupatel/demo,ntt-sic/keystone,rajalokan/keystone,savi-dev/keystone,derekchiang/keystone,takeshineshiro/keystone,rickerc/keystone_audit,himanshu-setia/keystone,jumpstarter-io/keystone,citrix-openstack-build/keystone,rushiagr/keystone,ntt-pf-lab/backup_keystone,ging/keystone,blueboxgroup/keystone,roopali8/keystone,kwss/keystone,derekchiang/keystone,cloudbau/keystone,jamielennox/keystone,nuxeh/keystone,ilay09/keystone,nuxeh/keystone,derekchiang/keystone,cbrucks/Federated_Keystone,jonnary/keystone,admiyo/keystone,dstanek/keystone,ilay09/keystone,cbrucks/Federated_Keystone,cbrucks/keystone_ldap,openstack/keystone,sileht/deb-openstack-keystone,JioCloud/keystone,rickerc/keystone_audit,rajalokan/keystone,vivekdhayaal/keystone,ajayaa/keystone,savi-dev/keystone,klmitch/keystone,UTSA-ICS/keystone-kerberos,takeshineshiro/keystone,nuxeh/keystone,promptworks/keystone,ilay09/keystone,ntt-pf-lab/backup_keystone,townbull/keystone-dtrust,ntt-sic/keystone,vivekdhayaal/keystone,cbrucks/keystone_ldap,dsiddharth/access-keys,rickerc/keystone_audit,openstack/keystone,cernops/keystone,dims/keystone,rushiagr/keystone,sileht/deb-openstack-keystone,jamielennox/keystone,cloudbau/keystone,dsiddharth/access-keys,ajayaa/keystone,ntt-pf-lab/backup_keystone,dims/keystone,JioCloud/keystone,jonnary/keystone,klmitch/keystone,dsiddharth/access-keys,cloudbau/keystone,openstack/keystone,kwss/keystone,dstanek/keystone,UTSA-ICS/keystone-kerberos,citrix-openstack-build/keystone,ntt-sic/keystone,MaheshIBM/keystone,kwss/keystone,blueboxgroup/keystone,idjaw/keystone,mahak/keystone,savi-dev/keystone,maestro-hybrid-cloud/keystone,mahak/keystone,reeshupatel/demo,pvo/keystone,pvo/keystone,jumpstarter-io/keystone,himanshu-setia/keystone,maestro-hybrid-cloud/keystone,admiyo/keystone,cernops/keystone,rodrigods/keystone,roopali8/keystone,townbull/keystone-dtrust,sileht/deb-openstack-keystone,rodrigods/keystone,citrix-openstack-build/keystone,reeshupatel/demo,vivekdhayaal/keystone,cbrucks/keystone_ldap,rajalokan/keystone,promptworks/keystone,pvo/keystone,dstanek/keystone,cbrucks/Federated_Keystone,idjaw/keystone