fixed a bug where the program does not sweep latest-version-consistent keys correctly
Merge branch 'persistency-check' of git://github.com/zhongjiewu/voldemort into persistency-check
Added multiple-key options to ConsistencyFix tool.

src/java/voldemort/utils/ConsistencyFix.java
- Options for keys:
  --key : single key
  --keys : list of keys on command line
  --key-file : file of keys, one per line.
  keys are in hexadecimal.
- A bunch of TODOs for next step code cleanup, hardening, improving.