fan-monitor: use sd_notify(READY=1)

After the fans have initialized their Functional inventory
property, send systemd the READY notification.  If the service
which runs this application is of type = notify, then systemd
will hold off starting any dependent services until this is sent.

In our case, we want phosphor-fan-control --control to not be
started until this notification is done.

Change-Id: Iec87418ce308aa9ca81a47c20039ade7e8fe66c3
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
2 files changed