make project compile

* remove unnecessary and invalid parts

Author: goekay

src/main/java/de/rwth/idsg/steve/repository/SecurityRepository.java

@@ -28,8 +28,7 @@
 
 public interface SecurityRepository {
 
-    void insertSecurityEvent(String chargeBoxId, String eventType, DateTime timestamp, String techInfo,
-                             String severity);
+    void insertSecurityEvent(String chargeBoxId, String eventType, DateTime timestamp, String techInfo);
 
     List<SecurityEvent> getSecurityEvents(String chargeBoxId, Integer limit);