Add sanitize method for application edition.

src/main/java/org/cerberus/services/ApplicationService.java

@@ -43,6 +43,7 @@ public class ApplicationService {
 
     public Application update(Application application) {
         applicationValidator.checkAllAttributsConstraints(application);
+        applicationValidator.sanitize(application);
         applicationRepository.save(application);
         return application;
     }

src/main/java/org/cerberus/validators/ApplicationValidator.java

@@ -14,4 +14,9 @@ public class ApplicationValidator {
             throw new BadRequestException("Please fill up all required fields.");
         }
     }
+
+    public void sanitize(Application application) {
+        application.getAdministratorList().clear();
+        application.getConfigurationFileList().clear();
+    }
 }