[issue24809] Add getprotobynumber to socket module

[Will Booth]

Will Booth added the comment:

Allow users to translate protocol numbers from IPv4/IPv6 headers to a friendly human readable string.

Just filling a gap in the API. There might be a PyPI package out there similar to socket. However, it's complementary function,'getprotobyname', already exist here. getprotobynumber just flips getprotobyname around.

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<http://bugs.python.org/issue24809>
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