Improve -s option so that we don't need to ship special config files around for NSDI graph any more.  Before, -s could only be used to enable things and not disable them.  Now, if any -s flag is specified, set all runtime options controlled by -s flag.  If the bit is on, the option is enabled.  If the bit is off, the option is disabled.
Improve -s option so that we don't need to ship special config files
around for NSDI graph any more.  Before, -s could only be used to
enable things and not disable them.  Now, if any -s flag is specified,
set all runtime options controlled by -s flag.  If the bit is on,
the option is enabled.  If the bit is off, the option is disabled.

-s 1	controls if dhash client will order successors by latency.
-s 2 	controls if greedy lookup is used (an unused toes related option).
-s 4	controls if "stop early" code is used in routing.

The defaults are set in random places in the source tree (by the
Configurator.)  If no -s flag is specified, continue to use the defaults.
This is currently equivalent to -s 5.

sit/dht,sit/dht,weidezhang/dht,weidezhang/dht,sit/dht,sit/dht,weidezhang/dht,weidezhang/dht,weidezhang/dht,sit/dht