rpcap: add timeout configuration on socket connect

[GabrielGanne]

Hi,

This is a small proposal to allow to configure the connection timeout for rpcap sockets. This is just to avoid waiting minutes for nothing should the connect() call fail.

Best regards,

[infrastation]

Thank you for preparing these changes and addressing the CI feedback. Please do not include the regenerated configure script into the commits.

[GabrielGanne]

Thank you for preparing these changes and addressing the CI feedback. Please do not include the regenerated configure script into the commits.

Done. Sorry, I forgot to clean them out of the PR.

[infrastation]

The second commit ("rpcap: set keepalives on rpcap's control socket") is almost an exact copy of the changes from pull request #773, which still requires significant work to become good for merging (see the detailed comments there).

[GabrielGanne]

Hi @infrastation Makes sense since it's the same original author. I should have seen it, sorry about that.

I'm willing to take over #773 and do the requested changes. I'll also remove that commit from here.

[infrastation]

@GabrielGanne, please go ahead with your version of the TCP keepalive patch.

[guyharris]

Does this work for rpcap-over-TLS connections?