Fix the parameter order of assertEqual in glanceclient test

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

Change-Id: I7722fdce766ce3cc5bc9944dc72d7d0af0b09f69
Partially-bug: #1277104
Merge "Fix the parameter order of assertEqual in glanceclient test"