Missing DISTRIBUTION flags

[titpetric]

While trying to achieve a failover/HA scenario, I noticed not all libmemcached 1.0.4 distribution options are supported right now.

Most notably what is missing is "MEMCACHED_DISTRIBUTION_RANDOM" in combination with EJECT options, but there are several other distribution algorithms available in libmemcached.

(just as a current workaround, had to use the KETAMA distribution to achieve some sort of failover for now).

[mkoppanen]

This has been fixed.