[HBASE-10393] Compaction Implemented

Author: abhinavbatra

Summary: Added a cli tool for compacting store files in a region

Test Plan: Unit Test

Reviewers: aaiyer, liyintang, rshroff, adela, manukranthk

Reviewed By: adela

CC: aizatto, hbase-eng@

Differential Revision: https://phabricator.fb.com/D1112260

Task ID: 3058153

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.89-fb@1560483 13f79535-47bb-0310-9956-ffa450edef68