Preserve tread interrupted status

src/main/java/com/zaxxer/hikari/HikariDataSource.java

@@ -287,7 +287,8 @@ public class HikariDataSource extends HikariConfig implements DataSource, Closea
             pool.shutdown();
          }
          catch (InterruptedException e) {
-        	 LOGGER.warn("Interrupted during closing", e);
+            LOGGER.warn("Interrupted during closing", e);
+            Thread.currentThread().interrupt();
          }
       }
    }