Currently glance (which is required for testing by keystone because
there is no python-glanceclient yet) requires distribute>=0.6.24,
but it can't be installed as a dependency of a dependency. Requiring
it explicitly here should help.
Install test-requires first, otherwise distribute doesn't get properly set.
Install distribute manually until we can re-address venv creation.
Align webob version to the other projects due to version conflicts.
Change-Id: Iac0b6860c600fbf230cf4f602ce1b76c68fcb7cd
0c18385fd1