[issue24809] Add getprotobynumber to socket module

[Will Booth]

New submission from Will Booth:

Add an old method from netdb to python for a best-effort, centerized look up. For the function to work, /etc/protocols would also need to be present. If the protocol doesn't exist OSError is raised. 

Patch attached.

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components: Extension Modules
files: proto.diff
keywords: patch
messages: 248128
nosy: wbooth
priority: normal
severity: normal
status: open
title: Add getprotobynumber to socket module
type: enhancement
versions: Python 3.6
Added file: http://bugs.python.org/file40137/proto.diff

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