This actually removes joins altogether, as well as references to self.worker_threads, which is best left as an implementation detail in BackgroundThreadService.
This makes use of hachikuji 's recent ducktape patch, and updates ducktape dependency to 0.5.0.
Author: Geoff Anderson <geoff@confluent.io>
Reviewers: Jason Gustafson <jason@confluent.io>, Ewen Cheslack-Postava <ewen@confluent.io>
Closes#1297 from granders/KAFKA-3581-systest-add-join-timeout
Tests rolling upgrade from PLAINTEXT to SSL
Author: Ben Stopford <benstopford@gmail.com>
Reviewers: Geoff Anderson, Ismael Juma
Closes#496 from benstopford/security-upgrade-test