Rebalance Cassandra and clean Zookeeper.

Added script to re-balance cassandra and cleanup zookeeper.
Thanks. Addressed in newest pull.

On Mon, Oct 20, 2014 at 10:20:57PM -0700, Meni Vaitsi wrote:
> > +                ssh $MASTER $CMD move $key -h $x > /dev/null
> > +                echo "   node $x gets token $key"
> > +                let $((num_key += slice))
> > +        done
> > +fi
> > +
> > +# Repair all nodes.
> > +echo "Repairing and cleaning nodes."
> > +for x in $DB_HOSTS ; do
> > +        echo -n "   working on $x: repairing,"
> > +        ssh $MASTER $CMD repair ${KEYSPACE} -h $x > /dev/null
> > +        echo " cleaning."
> > +        ssh $MASTER $CMD cleanup -h $x > /dev/null
> > +done
> > + 
> > + 
> 
> Delete this empty line.
> 
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-- 
Graziano Obertelli
AppScale Systems