deadlocks with python 3.2 / 3.2.1

[ThomasWaldmann]

the tests deadlock (won't complete) somewhere in the remote archiver tests when using old python versions:

• python 3.2.x affected versions: 3.2(.0), 3.2.1 (it works for 3.2.2+)
• python 3.3, 3.4, 3.5 is not affected.

it can well be that you will also experience issues in practice when running an affected version - the archiver tests are rather high-level and simulate borg commandline invocations.

Thus, running borg with python 3.2(.0) and 3.2.1 is not supported / not recommended.
This is likely caused by an issue in Python that was fixed long ago (but after 3.2.1).

[ThomasWaldmann]

Note: This will solve by implementing #65.