bpo-34587, test_socket: remove RDSTest.testCongestion() (GH-9277)


The test tries to fill the receiver's socket buffer and expects an
error. But the RDS protocol doesn't require that. Moreover, the Linux
implementation of RDS expects that the producer of the messages
reduces its rate, it's not the role of the receiver to trigger an
error.

The test fails on Fedora 28 by design, so remove it.
(cherry picked from commit 7484bdfd1e2e33fdd2c44dd4ffa044aacd495337)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
2 files changed