Replace assertEquals with assertEqual - 1/2

Replace assertEquals with assertEqual - 1/2

The method assertEquals has been deprecated since python 2.7.
http://docs.python.org/2/library/unittest.html#deprecated-aliases

Also in Python 3, a deprecated warning is raised when using assertEquals
therefore we should use assertEqual instead.

This patch is a mere sed replace of one-liner assertEquals to assertEqual.

grep -lR "assertEquals(" cinder/tests/* | \
xargs sed -ri 's/(\W+self.assertEqual)s(.+)(\)$)/\1\2\3/'

Change-Id: I4feea94d53afa866af9b7e14bd80345fa7276e75