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/command/executable/email/SetPasswordCommandTest.java

@@ -1,5 +1,6 @@
 package fr.xephi.authme.command.executable.email;
 
+import fr.xephi.authme.TestHelper;
 import fr.xephi.authme.datasource.DataSource;
 import fr.xephi.authme.message.MessageKey;
 import fr.xephi.authme.security.PasswordSecurity;
@@ -8,6 +9,7 @@ import fr.xephi.authme.service.CommonService;
 import fr.xephi.authme.service.PasswordRecoveryService;
 import fr.xephi.authme.service.ValidationService;
 import org.bukkit.entity.Player;
+import org.junit.BeforeClass;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.InjectMocks;
@@ -45,6 +47,11 @@ public class SetPasswordCommandTest {
     @Mock
     private ValidationService validationService;
 
+    @BeforeClass
+    public static void setUpLogger() {
+        TestHelper.setupLogger();
+    }
+
     @Test
     public void shouldChangePassword() {
         // given