test: Relax RHEL 8 expected tracer failure

This also sometimes crashes in `bus.unit_path_from_pid`. Relax the
pattern to cover either.

test/common/testlib.py

@@ -1731,7 +1731,7 @@ def login_and_go(self, path: Optional[str] = None, user: Optional[str] = None, h
 
     if testvm.DEFAULT_IMAGE.startswith('rhel-8') or testvm.DEFAULT_IMAGE.startswith('centos-8'):
         # old occasional bug in tracer, does not happen in newer versions any more
-        default_allowed_console_errors.append('Tracer failed:.*bus.get_unit_property_from_pid.*IndexError')
+        default_allowed_console_errors.append('Tracer failed:.*bus.*_pid.*IndexError')
 
     env_allow = os.environ.get("TEST_ALLOW_BROWSER_ERRORS")
     if env_allow: