Allow peer addresses to have multiple colons for ipv6

ipv6 ips aren't working because the colon existence is assuming a port was passed in. Here is a demo using LWP::Simple which fails without this patch:

#!/usr/local/bin/perl
use Net::INET6Glue::INET_is_INET6;
use LWP::Simple;
my $ua = new LWP::UserAgent;
my $url = 'http://[2001:4998:c:401::c:9101]/';
print "Attempting to fetch: $url\n";
my $response = $ua->get( $url );
if ($response->is_success) {
        print $response->decoded_content;
} else {
        print STDERR $response->status_line, "\n";
}