Better documentation, error messages, defaults regarding the gige socket-buffer-size

[dkogan]

These are the result of me encountering and debugging packet-dropping issues: https://github.com/AravisProject/aravis/issues/894

Primarily these patches add more error reporting and documentation. With the extended error messages I think it makes sense to change the default socket-buffer policy to ARV_GV_STREAM_SOCKET_BUFFER_AUTO, which this patch series does.

There's one more thing I would change also, but want to get your thoughts about all this first:

If setsockopt() returns success, but doesn't actually give us the requested buffer, we currently:

• Report a arv_warning_interface()
• arv_socket_set_recv_buffer_size() returns FALSE But the caller of arv_socket_set_recv_buffer_size() doesn't do anything with this FALSE, and things continue as normal. I would make this a hard error, and I'd change the arv_warning_interface() to something that would be seen even without any ARV_DEBUG flags.

Thanks much

[EmmanuelP]

Hi,

Sorry for being late reviewing this merge request. Be patient, I will dedicate some time to aravis this summer.