[Debian-med-packaging] cain is marked for autoremoval from testing

[Debian testing autoremoval watch]

cain 1.10+dfsg-2 is marked for autoremoval from testing on 2017-01-24

It (build-)depends on packages with these RC bugs:
840823: execnet: testing/test_gateway.py::TestBasicGateway::test_gateway_status_busy[thread-popen] FAILED
846951: execnet: testing/test_gateway.py::TestTracing::test_popen_stderr_tracing FAILED
846952: execnet: testing/test_channel.py::TestStringCoerce::test_2to3 FAILED