Add some new authentication error codes for specific errors.

This might make it a bit cleaner to handle new authentication types;
clients will still have to check for PCAP_ERR_AUTH with particular error
strings to detect "that authentication type isn't supported by the
server", but at least they can check first for
PCAP_ERR_AUTH_TYPE_NOTSUP.

Also add PCAP_ERR_AUTH_FAILED for authentication failures and
PCAP_ERR_TLS_REQUIRED for "the server requires TLS".  PCAP_ERR_AUTH is
used for all other errors, including internal errors.

While we're at it, fix one case where the wrong error code was returned
for "set sampling" request errors.

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