Fix Java 9 support for Pbkdf2Django (#1390)

* Replace DatatypeConverter in Pbkdf2Django to support Java 9

* Fix NPE in AuthMeInitializer and CastException in Recovery tests

* Set logger for SetPasswordTest to prevent NPE on logging

* Use TestHelper for initializing ConsoleLogger

src/test/java/fr/xephi/authme/service/RecoveryCodeServiceTest.java

@@ -125,7 +125,7 @@ public class RecoveryCodeServiceTest {
         return ReflectionTestUtils.getFieldValue(RecoveryCodeService.class, recoveryCodeService, "recoveryCodes");
     }
 
-    private ExpiringMap<String, String> getTriesCounter() {
+    private ExpiringMap<String, Integer> getTriesCounter() {
         return ReflectionTestUtils.getFieldValue(RecoveryCodeService.class, recoveryCodeService, "playerTries");
     }
 }