Remove unused variable assignment

This variable was assigned a value and then later assigned a new
value without ever being read in between, so the first assignment
had no affect.

Change-Id: I535776f5aa7b634375df23a4efae7e29d6e3d008
Removes xrange for Python3 compat

I'm using the builtin range instead of six.moves.range because we're
creating small lists of integers so there really isn't much or a
performance impact.

Change-Id: I9f4a5e9f21e0fd95ffe391eda3aa635938170504
Implements: bp keystone-py3kcompat
Merge "Removes xrange for Python3 compat"
Merge "Remove unused variable assignment"