Updated openstack/openstack
Project: openstack/heat  b7f3c62f653f3bd86171158a4ee8ddea6b629a1d
null
Fix comparison with singletons

Many plases in tests code use assertEqual(AA, None),
the same with True and False and negatives of such comparisons.

As comparison to singletons must use `is` operator, appropriate usage
is assertIs, assertIsNot, assertIsNone, assertIsNotNone

These assertions are provided by the `testtools` package,
so this change is not breaking backward compatibility with Python 2.6

This first patch inlcudes roughly half of the files touched by these changes
(up to and including test_n* sans `contrib` code) to ease the review.

Partial-Bug: #1259023

Change-Id: If6779c9230cf73ab93165a00040d1ca32d087c80