Simple Format changes.
Uncommenting config portion of Switch_Setup for testing purpose
Packstack issue for comma seperation in drivers resolved.
field for packstack driver resolved properly to cisco_nexus from cisco-nexus
Path changed for purpose of execution from integrator.py
Merge pull request #32 from sai-sriram-mahavadi/sw-refactor

Sw refactor - Refactoring for Switch module and Packstack Module