Monitor : avoid mapper lookups in Tach Sensor

There is a race condition that can fail in certain situations where
mapper has not completed introspection, causing a lookup failure and
D-Bus exception. This change uses a hard-coded service name, thus
avoiding the lookup and allowing tach sensors to write status directly
to inventory.

Signed-off-by: Mike Capps <mikepcapps@gmail.com>
Change-Id: If6ad105055762c6240b36d904d169094088b7c81
2 files changed