AdvancedLdapLoginModule: Service Principal is not constructed from java.naming.provider.url

When using org.jboss.security.negotiation.AdvancedLdapLoginModule chained with SPNEGO/Kerberos against Active Directory, the service principal specified in the TGS-REQ is ldap/foo.com, even though java.naming.provider.url is set to LDAP://dc1.foo.com.

Because of this, the /Secured test in the jboss-negotiation-toolkit will fail to bind to AD/LDAP because the KDC returns an error KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN.

The correct service principal name that the TGS-REQ should request is LDAP/dc1.foo.com because dc1.foo.com is what was provided in java.naming.provider.url.