The script to install the git versions of the libraries wasn't working
because it wasn't installing over top of the versions already installed
by pip. So by adding an uninstall first, we ensure that the git version
is actually installed.
Also, add a pbr freeze to the end so that we can verify, and some +x so
that we can see the output of our scripts.
And: novaclient 8.0 doesn't have these calls anymore. However, the tests we
had on legacy clouds were erroneously installing the wrong version of
novaclient so we did not catch it. Doh. This has to do the tests and the
calls in the same patch because the fix to the gate job to install the
correct verison of the library exposed the fact that we had be broken
for these for a few minutes.
Depends-On: I208e8c009d0438de19cd3eb08dc45ddebb45d3e9
Change-Id: I4fd882aeb8373b94c7f6b54d97b457042b324361
a88d41e302