Various minor changes

- AsynchronousLogin: call common permission methods through CommonService instead of PermissionsManager
- CommandManager: remove superfluous replacement of %p (handled by lazy tag replacer)
- Remove unused method in CommonService
- Create DebugSectionConsistencyTest
- SendMailSSL: Enable debug output if AuthMe log level is set to debug
- Add Utils#logAndSendMessage and replace existing, separate implementations

src/main/java/fr/xephi/authme/service/CommonService.java

@@ -65,16 +65,6 @@ public class CommonService {
         messages.send(sender, key, replacements);
     }
 
-    /**
-     * Retrieves a message.
-     *
-     * @param key the key of the message
-     * @return the message, split by line
-     */
-    public String[] retrieveMessage(MessageKey key) {
-        return messages.retrieve(key);
-    }
-
     /**
      * Retrieves a message in one piece.
      *
@@ -102,6 +92,7 @@ public class CommonService {
      * @param player the player to process
      * @param group the group to add the player to
      */
+    // TODO ljacqu 20170304: Move this out of CommonService
     public void setGroup(Player player, AuthGroupType group) {
         authGroupHandler.setGroup(player, group);
     }