Added attributes that are part of hte interface to several test fakes

Done.

On Mon Oct 27 2014 at 12:53:32 PM Paul Kehrer <notifications@github.com>
wrote:

> In .travis/run.sh:
>
> > @@ -18,4 +18,4 @@ if [[ "$(uname -s)" == "Darwin" ]]; then
> >      fi
> >  fi
> >  source ~/.venv/bin/activate
> > -tox -e $TOX_ENV -- $TOX_FLAGS
> > +tox -e "$TOX_ENV" -- $TOX_FLAGS
>
> Yeah I think so.
>
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> <https://github.com/pyca/cryptography/pull/1448/files#r19432480>.
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