Use assertEqual() instead of assertDictEqual()
Use assertEqual() instead of assertDictEqual()

In unittest2, assertDictEqual() is implemented by
using != operator to compare two dicts. So is
assertEqual() in testtools. assertEqual() in
testtools is able to handle dict, list, set and so
on. So we just call assertEqual() to make the unit
tests simpler.

Change-Id: I5eeeebced716f2065e81d72a9972392ae3a45d89

dtroyer/osc-lib