[CDH4] Bump version to v2.1.0

Change-Id: I8950804efd1df67684dfe6e8c4a280904cf958ef
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4569
Reviewed-by: Lenni Kuff <lskuff@cloudera.com>
Tested-by: Lenni Kuff <lskuff@cloudera.com>