Error handling for GpioMonitor class

In case of any exception in the construction of GpioMonitor class, VPD
Manager need not skip rest of the processings.
Instead, code has been modified to handle t

Error handling for GpioMonitor class

In case of any exception in the construction of GpioMonitor class, VPD
Manager need not skip rest of the processings.
Instead, code has been modified to handle the exception locally by
logging appropriate PEL and allowing VPD-Manager to continue with rest
of the processings.

Change-Id: Iccf421da175ec264a8aff149c360ba7ad105fbe9
Signed-off-by: Sunny Srivastava <sunnsr25@in.ibm.com>

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Revamped code for VPD parser

The commit removes all the pre-existing code from the branch
and pushes the revamped code.

Major modification includes:
- Movement from multi exe to single daemon model

Revamped code for VPD parser

The commit removes all the pre-existing code from the branch
and pushes the revamped code.

Major modification includes:
- Movement from multi exe to single daemon model.
- Multithreaded approach to parse FRU VPD.
- Better error handling.
- Refactored code for performance optimization.

Note: This code supports all the existing functionalities as it is.

Change-Id: I1ddce1f0725ac59020b72709689a1013643bda8b
Signed-off-by: Sunny Srivastava <sunnsr25@in.ibm.com>

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