Accton 1.6.1

Hi 
I just created a branch from 1.6.1 for a few Accton devices.  These are for immediate requests for ONIE certification based on existing code.  The first submit is for AS4600-54X.
What do these lines do?

In general we cannot have platform specific code like this in the core ONIE code.  Maybe the installer pre/post handler idea would work here.  See this pull request:
https://github.com/onie/onie/pull/3