environs/openstack: ProviderSuite runs faster
environs/openstack: ProviderSuite runs faster

We have the ProviderSuite to run tests that don't actually depend on having a
Provider that is running. This was factored out of the localLiveSuite.
However, localLiveSuite was calling openstack.ShortTimeouts() as a side effect
of starting the local server. This just makes all ProviderSuite tests
call ShortTimeouts so that the tests run in 0.25s instead of 9.2s.

R=dimitern
CC=
https://codereview.appspot.com/7548044

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