Close DriverService and DriverCommandExecutor executor on quit. Fixes #9666

* Close DriverService executor on quit

* Close DriverCommandExecutor executor on quit

Author: pujagani

java/client/src/org/openqa/selenium/remote/service/DriverCommandExecutor.java

@@ -130,6 +130,8 @@ public Response execute(Command command) throws IOException {
       } catch (InterruptedException e) {
         Thread.currentThread().interrupt();
         throw new WebDriverException("Timed out waiting for driver server to stop.", e);
+      } finally {
+        executorService.shutdownNow();
       }
 
     } else {

java/client/src/org/openqa/selenium/remote/service/DriverService.java

@@ -286,6 +286,7 @@ public void stop() {
     } finally {
       process = null;
       lock.unlock();
+      executorService.shutdownNow();
     }
 
     if (toThrow != null) {