Add BusName directives to service files

Adding the BusName directive to service files enables systemd to better
know when the daemon is started up enough to begin operations. This
is useful for dep

Add BusName directives to service files

Adding the BusName directive to service files enables systemd to better
know when the daemon is started up enough to begin operations. This
is useful for dependencies, so that the dependent service is delayed
until its dependency is ready to process.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Id3214ce4f0d9536b560d4505e5b45eaed179941f

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move all sensor daemons to libexec

Per the organization anti-pattern, executables are expected to be
installed into libexec instead of bin[1]. Update service files and
meson to install there.

[1]:

move all sensor daemons to libexec

Per the organization anti-pattern, executables are expected to be
installed into libexec instead of bin[1]. Update service files and
meson to install there.

[1]: https://github.com/openbmc/docs/blob/master/anti-patterns.md#incorrect-placement-of-executables-in-sbin-usrsbin-or-bin-usrbin

Change-Id: I1eb4003e94b83b09829d63346c2e16a3ff02a3e9
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

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ExternalSensor: New service for external sensors

This code was mostly copied from HwmonTempSensor, and inspired by the
initial proof of concept from https://gerrit.openbmc-project.xyz/35476

Externa

ExternalSensor: New service for external sensors

This code was mostly copied from HwmonTempSensor, and inspired by the
initial proof of concept from https://gerrit.openbmc-project.xyz/35476

External sensors are designed to be placeholders, with no hwmon or
other hardware support locally. Thus, there is no detection or kernel
driver load, so no change is necessary to entity-manager.

The expectation is that these sensors will be updated by something
external to the BMC, such as the host, which can be useful for
including host-based sensors into phosphor-pid-control thermal zones.

* Added systemd service file, similar to the others.
* Added CMakeLists blocks, similar to the others.
* Also cleaned up some nearby formatting in CMakeLists.

Tested: With the addition of the Mutable feature from 36275, and the
installation of the systemd file from 36272, and a change to our IPMI
daemon (still in the process of being upstreamed), the host can write
to a sensor over IPMI. It correctly shows up in the IPMI SDR, and the
written value correctly shows up on the D-Bus ExternalSensor here.

Here is example JSON for use with entity-manager:
{
"Name": "HostOnlyDevTemp",
"Measure": "temperature",
"MinValue": -10.0,
"MaxValue": 117.5,
"Type": "ExternalSensor"
},

Signed-off-by: Josh Lehan <krellan@google.com>
Change-Id: Id499e1cd6c7918179bb1729e5ce8546cf4121dfa
Signed-off-by: Ed Tanous <edtanous@google.com>

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