apparmor-session-lockdown: allow dpkg-query -W apertis-tests to fail

This test is run from the source tree, so there's no guarantee
that this query will return anything.

Reviewed-by: Philip Withnall <philip.withnall@collabora.co.uk>
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D3487

apparmor/session-lockdown/no-deny

@@ -216,7 +216,7 @@ if __name__ == '__main__':
     if os.getuid() != 0:
         raise SystemExit('You must be root to run this test')
 
-    log_subprocess('dpkg-query', '-W', 'apertis-tests')
+    log_subprocess('dpkg-query', '-W', 'apertis-tests', may_fail=True)
     log_subprocess('dpkg-query', '-W', 'apertis-tests-apparmor-report')
     log_subprocess('dpkg-query', '-W', 'apparmor-utils')