[issue20868] Lib/test/test_socket.py: skip testGetServBy if /etc/services is not found

[Ned Deily]

Ned Deily added the comment:

Unfortunately, how getservbyname() and other similar network interface functions get their data is platform-dependent. /etc/services is a traditional file location but many modern systems use a database or shared database (e.g. NIS) and even allow the system administrator to dynamically change the source of the data.  So, checking for /etc/services would cause the test to be skipped needlessly.  I would think that most systems would not be very usable without a working getservbyname().  Under what circumstances is this causing a problem for you?

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nosy: +ned.deily

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<http://bugs.python.org/issue20868>
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