Backport watchdog fixes/features

Closed Pat Riehecky requested to merge jcpunk/systemd:c9s into c9s

Merge Request Required Information

Summary of Changes

Backport fix for watchdog detection and dbus info about watchdog.

Approved Bugzilla Ticket

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https://bugzilla.redhat.com/show_bug.cgi?id=2126819

Merge request reports