Always use /dev/loop0

It shouldn't be though.

Signed-off-by: Kazuyoshi Kato <[email protected]>

Author: kzys

tests/integration_tests/functional/test_drives.py

@@ -94,7 +94,7 @@ def test_rescan_dev(test_microvm_with_ssh, network_config):
 
     # "losetup --find" may slow down tests due to
     # https://github.com/firecracker-microvm/firecracker-containerd/issues/141
-    loopback_device = f'/dev/loop{os.getpid()}'
+    loopback_device = '/dev/loop0'
     losetup = ['losetup', loopback_device, fs2.path]
     run(losetup, check=True)