Fix IPv6 check
Fix IPv6 check

IPv6 test should be skipped if both IPv6 address family
is not recognize and if we can't bind to ::1

Closes-Bug: #1263663
Change-Id: I7f70719ffb7cf51ba3100a82da68d1af9a41623f

rajalokan/keystone,blueboxgroup/keystone,vivekdhayaal/keystone,jonnary/keystone,MaheshIBM/keystone,nuxeh/keystone,klmitch/keystone,jamielennox/keystone,mahak/keystone,ajayaa/keystone,JioCloud/keystone,ilay09/keystone,derekchiang/keystone,himanshu-setia/keystone,reeshupatel/demo,promptworks/keystone,rajalokan/keystone,dsiddharth/access-keys,mahak/keystone,promptworks/keystone,MaheshIBM/keystone,dstanek/keystone,takeshineshiro/keystone,ilay09/keystone,openstack/keystone,reeshupatel/demo,blueboxgroup/keystone,vivekdhayaal/keystone,ilay09/keystone,dsiddharth/access-keys,rushiagr/keystone,vivekdhayaal/keystone,derekchiang/keystone,takeshineshiro/keystone,cernops/keystone,dstanek/keystone,dims/keystone,ging/keystone,maestro-hybrid-cloud/keystone,UTSA-ICS/keystone-kerberos,JioCloud/keystone,openstack/keystone,roopali8/keystone,rodrigods/keystone,nuxeh/keystone,UTSA-ICS/keystone-kerberos,openstack/keystone,idjaw/keystone,dsiddharth/access-keys,jonnary/keystone,ajayaa/keystone,derekchiang/keystone,dstanek/keystone,ging/keystone,roopali8/keystone,maestro-hybrid-cloud/keystone,jamielennox/keystone,nuxeh/keystone,promptworks/keystone,klmitch/keystone,dims/keystone,rajalokan/keystone,mahak/keystone,reeshupatel/demo,himanshu-setia/keystone,rushiagr/keystone,idjaw/keystone,jumpstarter-io/keystone,rodrigods/keystone,jumpstarter-io/keystone,cernops/keystone,jumpstarter-io/keystone,rushiagr/keystone