If an user sends host notification without host status:
openstack notification create COMPUTE_HOST <host> <date> '{"event": "STOPPED"}'
logging registers silly error like object None has not method 'upper' and
notification gets status 'running', host is set in maintenance status.
It's impossible to set manually host status to non-maintanence
until there are host-related running notifications.
Running notifications are expired in 24 hours by default.
The patch makes engine to set 'ignore' status for such
notifications.
Closes-Bug: 1960619
Change-Id: Id873b3300b6de49082805654c85414a8868dd925