Implement a flag to enable fallback always

On some machines we want our watchdog running as long as the
phosphor-watchdog daemon is alive. This patch adds an option to enter
fallback mode any time the watchdog expires or is set to be disabled.

Change-Id: Ic96d2f15c761aeb4e25158c5bd861076cca6497d
Signed-off-by: William A. Kennington III <wak@google.com>
5 files changed