The __eq__ of apiclient.base.Resource will return True,
if the two objects have same id, even if they have different
other attributes value. The behavior is weird and don't
match the semantics of object equal. The objects that have
different value should be different objects.
Fix this issue and add some test cases in this patch.

Change-Id: I24ba39bf90d727116f256de46241746520efbfee
Closes-Bug: #1499369

This patch moves the glanceclient unit tests to the standard directory
(xxxclient/tests/unit) in preparation for adding functional gate tests
'check-glanceclient-dsvm-functional' in the same vein as existing client
tests for other projects, eg:

* check-novaclient-dsvm-functional
* check-keystoneclient-dsvm-functional
* check-neutronclient-dsvm-functional

Change-Id: I29d4b9e3a428c851575ee9afde40d6df583456c4