tests: Call wait_for_up in Microvm.restore_from_snapshot

After restoring a snapshot, we are not waiting for the VM to finish
booting (it needs to have done that before we took a snapshot), but
having a `wait_for_up` here is still a good sanity check for ensuring
the VM is still responsive. So far our tests have been inconsistent on
whether to put a `wait_for_up` here. This makes them consistent by
always doing `wait_for_up` if a network device is available.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/framework/microvm.py

@@ -961,6 +961,9 @@ def restore_from_snapshot(
             enable_diff_snapshots=snapshot.is_diff,
             resume_vm=resume,
         )
+        # This is not a "wait for boot", but rather a "VM still works after restoration"
+        if snapshot.net_ifaces and resume:
+            self.wait_for_up()
         return jailed_snapshot
 
     def enable_entropy_device(self):