In Python3, range() creates a generator rather than a list.
None of the parameters in the ranges changed looked large enough
to create an impact in memory in Python2. Note: the only use of
range() was for iteration and did not need to be changed.
This is part of a series of changes to introduce Python3 support.
Change-Id: I50b665f9296ea160a5076c71f36a65f76e47029f