Remove test dep on name of dir (bug 1124283)

The name of the project's directory was previously hardcoded into the
tests, so tests would fail if executed from another directory (such as
"python-keystoneclient-master", as checked-out by keystone for
integration testing).

Also, the tests should now be executable on Windows.

Change-Id: I0a1e052054e509b0f795fd13f95a804e0c255907
Merge "Remove test dep on name of dir (bug 1124283)"