Turns out kerberos expects ticket instead of credentials

Author: robsdedude

testkit-backend/src/main/java/neo4j/org/testkit/backend/messages/requests/NewDriver.java

@@ -74,7 +74,7 @@ public TestkitResponse process( TestkitState testkitState )
                                           data.authorizationToken.getTokens().get( "realm" ) );
             break;
         case "kerberos":
-            authToken = AuthTokens.kerberos(data.authorizationToken.getTokens().get( "credentials" ));
+            authToken = AuthTokens.kerberos(data.authorizationToken.getTokens().get( "ticket" ));
             break;
         default:
             return BackendError.builder()