Thank you, Ross

Co-authored-by: Ross McFarland <rwmcfa1@gmail.com>

Also add _extra_changes to dynamic record tests to make them more
exhausitve.
Simplify root profile's endpoint names.

In Python 2.7 the if statement would catch both cases from the test
test_populate_lenient_fallback, so the test was failing. These are
the error strings differences between Python 2 and 3:

Python 2:
NoLenient: populate() got an unexpected keyword argument 'lenient'
NoZone: populate() got multiple values for keyword argument 'lenient'

Python 3:
NoLenient: populate() got an unexpected keyword argument 'lenient'
NoZone: populate() got multiple values for argument 'lenient'

Co-authored-by: Ross McFarland <ross@github.com>