LDAP/Kerberos authentication fails on RHVM when the ldap server hostname resolves to an IPv6 only address

Issue

• We use Kerberos for authentication for the RHV API and webUI
• This is configured in the file /etc/ovirt-engine/aaa/example.properties on the Hosted Engine

• The vars.server directive points to an LDAP server

  vars.server = ldap.example.com
  

• If this hostname only resolves to an IPv6 address, then the API/webUI cannot use it for authentication.

• SSO login fails and a normal login page is displayed but entering the correct credentials fails as well with: "Unable to log in. Verify your login information or contact the system administrator."
• If this hostname has an IPv4 address (in addition to IPv6), then the problem disappears