Detect another flavor of component already stopped.

When the WLAN Policy controller tries to stop a component, it
attempts to detect when the component is already stopped. A
recent change in the error message that occurs prevented this
from working; this change adds an additional flavor of error
message that matches the newly-seen behavior.

Fixes: https://fxbug.dev/116544
Test: antlion [...] -tc WlanPhyComplianceABGTest
Change-Id: I0ab8af9b5ad72b617ff8529d37bc14b549f7198c
Reviewed-on: https://fuchsia-review.googlesource.com/c/antlion/+/769633
Reviewed-by: Sam Balana <sbalana@google.com>
Commit-Queue: Karl Ward <karlward@google.com>
diff --git a/src/antlion/controllers/fuchsia_lib/lib_controllers/wlan_policy_controller.py b/src/antlion/controllers/fuchsia_lib/lib_controllers/wlan_policy_controller.py
index 1ca8a80..25f06b4 100644
--- a/src/antlion/controllers/fuchsia_lib/lib_controllers/wlan_policy_controller.py
+++ b/src/antlion/controllers/fuchsia_lib/lib_controllers/wlan_policy_controller.py
@@ -91,7 +91,8 @@
                 self.log.debug(f"Stopped session: {result.stdout}.")
             else:
                 if (b'InstanceNotFound' in result.stderr
-                        or b'instance was not found' in result.stderr):
+                        or b'instance was not found' in result.stderr
+                        or b'does not exist' in result.stderr):
                     self.log.debug(f'Instance was not found: {result.stderr}.')
                 else:
                     raise WlanPolicyControllerError(