fix sasl tests

apparently I broke them with the unix domain socket update, since you have to
add an environment variable for them to even run.

need to make it work with the unix socket at some point though.

t/binary-sasl.t

@@ -92,7 +92,7 @@ use constant RES_MAGIC        => 0x81;
 my $pwd=getcwd;
 $ENV{'SASL_CONF_PATH'} = "$pwd/t/sasl";
 
-my $server = new_memcached('-B binary -S ');
+my $server = new_memcached('-B binary -S -l 127.0.0.1 ');
 
 my $mc = MC::Client->new;