Add call to login test on instantiation of class

lib/directadmin.py

@@ -26,6 +26,13 @@ class DirectAdminClient:
                                                                        .encode()).decode('utf8'),
                         }
         self.url = url
+        try:
+            response = self.login_test()
+        except DirectAdminClientException as e:
+            raise e
+            
+
+
 
     def make_request(self, endpoint, data=None):
         response = None  # Empty response variable