Promote getPath() to PMBusBase

Promote the getPath() method from the PMBus class to the PMBusBase
parent class. This allows the method to be called from automated tests
using mock subclasses of PMB

Promote getPath() to PMBusBase

Promote the getPath() method from the PMBus class to the PMBusBase
parent class. This allows the method to be called from automated tests
using mock subclasses of PMBusBase.

Change-Id: I01dc6c314294e0de8919f78c79cbdc395020728f
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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pseq: Add Services class for automated testing

Add a Services class hierarchy to enable mocking and automated testing.
The class methods provide a high level abstraction for system services
like err

pseq: Add Services class for automated testing

Add a Services class hierarchy to enable mocking and automated testing.
The class methods provide a high level abstraction for system services
like error logging and presence detection.

* Services: Abstract base class
* BMCServices: Sub-class with real implementation using BMC services
* MockServices: Sub-class with mock implementation for automated testing

* Tested:
* Tested all methods in BMCServices class
* When method succeeds
* When method fails; verify all error paths
* The detailed test plan is available in a gist:
* https://gist.github.com/smccarney/e7a250011133c7e3040a8bce240705c5

Change-Id: If17ef8c4540b3ee07cced947bc49a950141b38ae
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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