gce_test fails with multiple failures.

I have done a fix in

        libcloud/compute/drivers/gce.py

To test that, I have done some changes in

        libcloud/test/compute/test_gce.py

As per documentation, When I run below test command

PYTHONPATH=. python libcloud/test/compute/test_gce.py

I am getting multiple AttributeError failures for GCEMockHttp object.

As a setup part, I provided my secrets in libcloud/test/secrets.py.

    Modified GCE_PARAMS and GCE_KEYWORD_PARAMS.

I have tried to run the test without any of my changes on trunk branch.

I still get same issue. Please find attached output file for details.

Note: When I run any other test, It works fine.

$ PYTHONPATH=. python libcloud/test/compute/test_ecs.py
.........................................................
----------------------------------------------------------------------
Ran 57 tests in 0.791s

OK
$

This is a blocker for me to merge the PR without a test.