Kerberos refactored to be federation provider. Support for Kerberos and LDAP. Username/password authentication support with kerberos credentials.

First step - KerberosFederationProvider

Finished KerberosFederationProvider. Added support for username/password authentication with kerberos credentials

Added Kerberos UI to LDAPFederationProvider

Fixes

examples/providers/federation-provider/src/main/java/org/keycloak/examples/federation/properties/BasePropertiesFederationProvider.java

@@ -1,5 +1,6 @@
 package org.keycloak.examples.federation.properties;
 
+import org.keycloak.models.CredentialValidationOutput;
 import org.keycloak.models.KeycloakSession;
 import org.keycloak.models.RealmModel;
 import org.keycloak.models.RoleModel;
@@ -127,6 +128,11 @@ public abstract class BasePropertiesFederationProvider implements UserFederation
         return supportedCredentialTypes;
     }
 
+    @Override
+    public Set<String> getSupportedCredentialTypes() {
+        return supportedCredentialTypes;
+    }
+
     @Override
     public boolean validCredentials(RealmModel realm, UserModel user, List<UserCredentialModel> input) {
         for (UserCredentialModel cred : input) {
@@ -155,6 +161,11 @@ public abstract class BasePropertiesFederationProvider implements UserFederation
         return true;
     }
 
+    @Override
+    public CredentialValidationOutput validCredentials(RealmModel realm, UserCredentialModel credential) {
+        return CredentialValidationOutput.failed();
+    }
+
     @Override
     public void close() {