regulators: Remove Services& from Sensors methods

Remove the Services& parameter from the Sensors methods. This parameter
introduces a circular include dependency, and the parameter was only
being

regulators: Remove Services& from Sensors methods

Remove the Services& parameter from the Sensors methods. This parameter
introduces a circular include dependency, and the parameter was only
being lightly used in two Sensors methods.

Tested:
* Verified that all DBusSensors methods work as expected.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I3b2c3ec0bec7ea51b24100531f3314e9f87cebee

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regulators: Create DBusSensors class

Create the DBusSensors class. This is a concrete implementation of the
Sensors abstract base class. This class manages all the voltage
regulator sensors in the

regulators: Create DBusSensors class

Create the DBusSensors class. This is a concrete implementation of the
Sensors abstract base class. This class manages all the voltage
regulator sensors in the system.

Also add a lastUpdateTime data member to the DBusSensor class. This
data member is set whenever the sensor is updated. This enables the
DBusSensors class to detect sensors that were not updated during the
current monitoring cycle.

Sensors that were not updated during the current monitoring cycle are
deleted. These sensors were likely produced by a hardware device that
was removed or replaced with a different version.

Tested:
* Ran through entire monitoring cycle multiple times
* Tested that lastUpdateTime is set correctly when a sensor is modified
* Sensor value updated
* Sensor disabled
* Sensor put in error state
* Tested where new sensor was created
* Tested where existing sensor was updated
* Tested where all sensors disabled
* Tested where all sensors for a rail put in error state
* Tested where sensors removed due to not being updated this cycle
* Tested where D-Bus exception occurs when trying to create a sensor
* See complete test plan at
https://gist.github.com/smccarney/69efb813c0005571aee687f67e489278

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Ib1fc399f100188cc048ac3ab5892117b74f844e9

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regulators: Create DBusSensor class

Create the DBusSensor class that represents a voltage regulator sensor
on D-Bus.

Each voltage rail in the system may provide multiple types of sensor
data, such

regulators: Create DBusSensor class

Create the DBusSensor class that represents a voltage regulator sensor
on D-Bus.

Each voltage rail in the system may provide multiple types of sensor
data, such as temperature, output voltage, and output current. A
DBusSensor tracks one of these data types for a voltage rail.

Class supports the following sensor operations:
* Create sensor
* Set sensor value
* Disable sensor (when system is powered off)
* Set sensor to error state (when unable to read value due to I2C error)
* Delete sensor

Note: A different class will implement the ObjectManager interface for
all voltage regulator sensors. That will be in a future commit.

Tested:
* Created a sensor of each supported type (vout, iout, etc.)
* Set the value of a sensor
* Tested update policies: hysteresis, highest, lowest
* Disabled a sensor
* Set a sensor to the error state
* Verified all D-Bus signals emitted
* InterfacesAdded signal emitted with all info when sensor created
* PropertiesChanged signal emitted when sensor properties change
* InterfacesRemoved signal emitted when sensor deleted
* See https://gist.github.com/smccarney/5ae989da1977162ae1a21c208d5302fc
for complete test plan.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I655277e6bf0a31a8778a54e87d5864f9951b045e

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regulators: Add Sensors service

Define the abstract base class Sensors. This class represents a service
that maintains a list of voltage regulator sensors.

This service makes the voltage regulator

regulators: Add Sensors service

Define the abstract base class Sensors. This class represents a service
that maintains a list of voltage regulator sensors.

This service makes the voltage regulator sensors available to other BMC
applications. For example, the Redfish support obtains sensor data from
this service.

Each voltage rail in the system may provide multiple types of sensor
data, such as temperature, output voltage, and output current. A sensor
tracks one of these data types for a voltage rail.

Also define a concrete subclass MockSensors used for test cases.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I0b1c28161bad899c6dd75f87b7ee8e891c8781af

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