[HBASE-10730] Optimize Delete Column on per StoreFile basis.

Author: everyoung

Summary:
1. add deleteColumn check on KeyValueHeap.generalizedSeek level.
2. small fix on createLastOnRow.

Test Plan:
Write one new unit tests.

MR test passed.

Reviewers: aaiyer, adela

Reviewed By: aaiyer

CC: hbase-dev@, fan, arice

Differential Revision: https://phabricator.fb.com/D1183910

Task ID: 2672883

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.89-fb@1577636 13f79535-47bb-0310-9956-ffa450edef68