sensor_monitor: Watch for interfacesRemoved

Now that the hwmontempsensor app can remove sensors from D-Bus when the
entity-manager config goes away, the sensor monitor needs to deal with
it.  It does so by watching for a threshold interface to be removed from
a sensor and removing that entry from its map of alarms to watch.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I6b48b20eb4d158e5e44566e46469421550d21686
2 files changed