Add rebalance shuffle script
Fix location of example stores
Add cluster expansion script
Fix comments
Get rid of tee-ing the plan to a separate file

The rebalance planner writes the output to a file named
plan.out so this is not needed anymore.
Remove vold_home parameter from scripts

These scripts are being shipped as part of vold repo and so
no need for this extra parameter.
Copy plan outout to the final directory
Cleanup minor typos and comments
Expose max contiguous partitons option to script