Change log to warning

Author: logachev

java-bigquery/google-cloud-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcUrlUtility.java

@@ -712,7 +712,7 @@ private static Map<String, String> parseUrlInternal(String url) {
           throw new BigQueryJdbcRuntimeException(
               String.format("Wrong value or unknown setting: %s", safeRef));
         } else {
-          LOG.severe("Wrong value or unknown setting: %s", safeRef);
+          LOG.warning("Wrong value or unknown setting: %s", safeRef);
           continue;
         }
       }