Fix the parameter order of assertEqual in glanceclient v2 test

On assertEqual, the order of parameters should be (expected, observed).
But, some part of glanceclient v2 test were written with invalid order.
This patch fixes this problem.

Partially Close-bug: #1277104

Change-Id: Iae3fb9dda28b67a07f527b15ca83d9cca3e867d4
Merge "Fix the parameter order of assertEqual in glanceclient v2 test"