When the server hostname resolved to both IPv4 and IPv6 addresses,
connecting would fail with nothing in syslog. This corrects that oversight.

Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>

Fixes #4343

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

On some systems too many retries with authentication failure results
in IP or username being locked out, so add option to prevent retries
in the event of authentication failure

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>

Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>