Use a consistent approach for producing warnings, but add a TODO for moving
this warning to the daemon, which can make a better call if it will work
or not (depending on networking mode).
This warning was originally added in [moby@afa92a9], before integration with
libnetwork, and this warning may be incorrect in many scenarios.
While updating, also removing the custom regular expression used to
detect if the IP is a loopback address, and using go's netip package
instead.
[moby@afa92a9]: afa92a9af0
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
bc90bb6855