The new testground version broke several features

From this Testground commit https://github.com/testground/testground/commit/92ff5c6314f6b80cc574c02cf980835f1429f6a4 where the supervisor was added, the execution of Testground tests is asynchronous breaking the following features of the testbed:

Benchmark scripts throws the tests but doesn't work for the result anymore.
Running a test from the Jupyter notebook throws always an error (the notebook thinks the test finished early when in reality is just that the supervisor accepted the execution)-
Running tests with local:exec doesn't work.
And many more I may be missing. Please report them so I can start fixing them ASAP.

protocol / beyond-bitswap