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travis-ci

--interface: add support for Linux VRF

The --interface command (CURLOPT_INTERFACE option) already uses
SO_BINDTODEVICE on Linux, but it tries to parse it as an interface or IP
address first, which fails in case the user passes a VRF.

Try to use the socket option immediately and parse it as a fallback
instead.  Update the documentation to mention this feature, and that it
requires the binary to be ran by root or with CAP_NET_RAW capabilities
for this to work.

Closes #2024

3 of 3 new or added lines in 1 file covered. (100.0%)

20393 of 27482 relevant lines covered (74.2%)

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