[HBASE-10393] Fix the offline compaction utility

Author: rshroff

Summary:
Fixing the offline compaction utility to take in the region name
to identify the region.

Test Plan: mr unit Tests

Reviewers: manukranthk, aaiyer, liyintang

Reviewed By: manukranthk

CC: hbase-dev@

Differential Revision: https://phabricator.fb.com/D1201790

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.89-fb@1576879 13f79535-47bb-0310-9956-ffa450edef68