Use fixtures from keystoneclient for static data

We should use the fixture generation code from keystoneclient rather
than keep our own copies of the token and discovery structure.

Change-Id: I53c1d2935d1d65c39b8abea89427af2fc3edd181
Tests work fine with random PYTHONHASHSEED

Change-Id: Iba6fc87bbff289ae2572a7eb132f5c946dfa0956
Related-Bug: #1348818
Merge "Use fixtures from keystoneclient for static data"
Merge "Tests work fine with random PYTHONHASHSEED"