test: mark killed microvm not spawned

Mark killed microVMs as not spawned, so that we don't try to kill them
twice. This avoids the spam we get in the CI that we are trying to kill
a non-existing PID. Also, clear the list of microVMs stored by
MicroVMFactory once we call kill() on it.

Signed-off-by: Babis Chalios <[email protected]>

Author: bchalios

tests/framework/microvm.py

@@ -252,6 +252,9 @@ def kill(self):
             self.expect_kill_by_signal = True
             utils.run_cmd("kill -9 {} || true".format(self.screen_pid))
 
+        # Mark the microVM as not spawned, so we avoid trying to kill twice.
+        self._spawned = False
+
         if self.time_api_requests:
             self._validate_api_response_times()
 
@@ -911,6 +914,8 @@ def kill(self):
                 shutil.rmtree(vm.jailer.chroot_base_with_id())
             vm.netns.cleanup()
 
+        self.vms.clear()
+
 
 class Serial:
     """Class for serial console communication with a Microvm."""