Revert "Use assertTrue/False instead of assertEqual(T/F)"
Revert "Use assertTrue/False instead of assertEqual(T/F)"

assertTrue is weaker than assertEqual(True,..) because
assertEqual also compares the type.

This reverts commit 749ea50598823cea4faac313ba81c6fda0f16070.

Change-Id: I1a716657c204feea2d07f9c4241d101f2c1c4621

openstack/oslo.cache,openstack/oslo.cache