Update to the new Autobahn test suite

[KushalP]

Webbit is currently tracking a non-existent Autobahn repo as a submodule.

Rather than explicitly calling a submodule, the virtualenv file can be update to use the package that has been built instead.

Here's the command to get the new Autobahn testsuite through pip: pip install autobahntestsuite

[KushalP]

Here's what I'll probably do in this case:

1. Delete the submodule requirement
2. Update the virtualenv.py bootstrap to pip install autobahntestsuite
3. Run the websocket tests as: wstest -m fuzzingclient -s fuzzingclient.json

What do you all think?

Also, for removing the submodule I'm going to do the following:

1. Delete the lines from the .gitmodules file
2. Delete the relevant section(s) from .git/config
3. Run git rm --cached path_to_autobahn
4. Commit and delete the now untracked submodule files

Anything I'm missing here?