Enable MultiHomed for IO::Socket::SSL

[atoomic]

Automatically fall back to IPv4 if IPv6 doesn't work

[skaji]

@atoomic Could you explain context for this change in more detail?

For IPv4 and IPv6, I believe IO::Socket::IP should take care of them without MultiHomed argument.

[atoomic]

Using the MultiHomed option for Socket allows to fall back to IPv4 if IPv6 fails.

Some servers have an IPv6 address assigned but lack usable IPv6 networking.
Enforcing 'MultiHomed' by default fixes this issue.

note that this can still be disabled if needed by providing MultiHomed => undef to _extra_sock_opts
we could also consider enabling it if needed, but IMO using a true value for MultiHomed should be the default behavior

cc: @skaji

[oalders]

Thanks, @atoomic!