[issue29767] build python failed on test_socket due to unused_port is actually used.

[Shuo Li]

New submission from Shuo Li:

I am running a debian system. And trying to build cpython3.6 from source. 
When I run make altinstall, it failed on test_socket. Reporting cli attribute is missing.

After some trouble shooting, it seems the support.get_unused_port() is not reliable. Then I modified it and return a port I am sure no one is using, the build succeeded.

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components: Build
messages: 289268
nosy: Shuo Li
priority: normal
severity: normal
status: open
title: build python failed on test_socket due to unused_port is actually used.
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29767>
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