merge with zy.
add new DiskManager.java and modify alter table renameClo function.
modify diskmanager.java in newms pacakage.
Merge remote-tracking branch 'origin/newms_zy' into newms_zqh
Merge remote-tracking branch 'origin/newms_zqh' into newms_zy
implement some RawStore method for DiskManager; update jedis