As reported in bug report #2987196, the code for ipv6 already did
the setting of this bit correctly so we copied that logic into
the Curl_ipv4_resolve_r() function as well. KRB code is the only
code we know that might need the cannonical name so only resolve
it for such requests!

Signed-off-by: Tor Arntsen <tor@spacetec.no>

no need to create a var - lets just return the status var itself.

The section that describes how to work with timeouts was
misleading and could easily trick users to use the wrong API.

c-ares has had its own URL for a while and we should point
people to that. It also works with IPv6 since a long time.

curl_multi_timeout(3) is simply the wrong function to use
if you're using the multi_socket API and this document now
states this pretty clearly to help guiding users.

I've done this blindly, and the last piece that works with ares
should possibly be done differently now that c-ares isn't a
subtree within the curl tree anymore...

Prefixing the FTP quote commands with an asterisk really only
worked for the postquote actions. This is now fixed and test case
227 has been extended to verify.

Reported by Guenter Knauf.

Signed-off-by: Ben Greear <greearb@candelatech.com>

Matt Wixson found and fixed a bug in the SCP/SFTP area where the
code treated a 0 return code from libssh2 to be the same as
EAGAIN while in reality it isn't. The problem caused a hang in
SFTP transfers from a MessageWay server.