hwmontempsensor: check active state before activation

The activate() function can be called by the createSensors() when host
power state changes, when host goes off and on again, the sensor will be

hwmontempsensor: check active state before activation

The activate() function can be called by the createSensors() when host
power state changes, when host goes off and on again, the sensor will be
activated repeatedly and cause coredump.

This commit add the check activation state before activating the sensor,
which reference from PSUSensor[1].

[1] https://gerrit.openbmc.org/c/openbmc/dbus-sensors/+/74727

Tested on Catalina, no more hwmontempsensor service crash when host
power state from off to running.

Change-Id: I72af303fe808538e20b60a5619c036973b3eac91
Signed-off-by: Potin Lai <potin.lai@quantatw.com>

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Move source files into application-specific sub-directories

Currently, dbus-sensors implement multiple applications:
- psusensor
- adcsensor
- intelcpusensor
- hwmontempsensor
- ipmbsensor
- n

Move source files into application-specific sub-directories

Currently, dbus-sensors implement multiple applications:
- psusensor
- adcsensor
- intelcpusensor
- hwmontempsensor
- ipmbsensor
- nvmesensor
- externalsensor
- mcutempsensor
- intrusionsensor
- fansensor
- exitairtempsensor

This commit is to create separate directories for each application so
that things can be separated more easily and the files are smaller,
instead of creating one huge file for the sensor implementation.

There was some discussion in discord on this. [1][2]

[1]: https://discord.com/channels/775381525260664832/1187158775438778408/1284106093756289067
[2]: https://discord.com/channels/775381525260664832/867820390406422538/1303217796821553214

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I258fc2ee7d8f939c7b83a07350395e78775b2b8d

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