Add custom exception class and type

The commit adds few custom exception class and type so that exact
exception can be thrown for a failure.
This is required to detect the type of failure and log ap

Add custom exception class and type

The commit adds few custom exception class and type so that exact
exception can be thrown for a failure.
This is required to detect the type of failure and log appropriate PEL
for the error. With just throwing runtime error in most of the cases it
is not possible to detect the reason for failure at catching point.

Change-Id: I672c3c5fd6d289b8e6943b9a22836acfb9e6b04b
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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