Fix bay number from IMM property in nextscale chassis
Fix bay number from IMM property in nextscale chassis

The property is ASCII representation of decimal number that would result
from erroneously evaluating BCD as normal.  Compensate by working back
to the hexadecimal representation and presenting that as a number.

Change-Id: I47ae2fe484c2eaaa4c103eae81c56f9561ac316c

openstack/pyghmi,stackforge/pyghmi,openstack/pyghmi