iotests: give tempdir an identifying name

If something goes wrong causing the iotests not to cleanup their
temporary directory, it is useful if the dir had an identifying
name to show what is to blame.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20240205155158.1843304-1-berrange@redhat.com>
Revieved-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/testenv.py

@@ -126,7 +126,7 @@ class TestEnv(ContextManager['TestEnv']):
             self.tmp_sock_dir = False
             Path(self.sock_dir).mkdir(parents=True, exist_ok=True)
         except KeyError:
-            self.sock_dir = tempfile.mkdtemp()
+            self.sock_dir = tempfile.mkdtemp(prefix="qemu-iotests-")
             self.tmp_sock_dir = True
 
         self.sample_img_dir = os.getenv('SAMPLE_IMG_DIR',