[PATCH 13/14] iotests/151: ensure subprocesses are cleaned up

["Daniel P. Berrangé" <berrange@redhat.com>]

The iotest 151 creates a bunch of subprocesses, with their stdout
connected to a pipe but never reads any data from them and does
not gurantee the processes are killed on cleanup.

This triggers resource leak warnings from python when the
subprocess.Popen object is garbage collected.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 tests/qemu-iotests/151 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tests/qemu-iotests/151 b/tests/qemu-iotests/151
index f2ff9c5dac..06ee3585db 100755
--- a/tests/qemu-iotests/151
+++ b/tests/qemu-iotests/151
@@ -263,6 +263,11 @@ class TestThrottledWithNbdExportBase(iotests.QMPTestCase):
                         break
                     except subprocess.TimeoutExpired:
                         self.vm.qtest(f'clock_step {1 * 1000 * 1000 * 1000}')
+                try:
+                    p.kill()
+                    p.stdout.close()
+                except:
+                    pass
         except IndexError:
             pass
 
-- 
2.49.0