[master] Unbreak the TestHLog test

Author: gauravm

Summary: Fixing the TestHLog test.

Test Plan: TestHLog#testLogCleaning works now.

Reviewers: fan, aaiyer

Reviewed By: fan

CC: hbase-eng@

Differential Revision: https://phabricator.fb.com/D984076

Task ID: 2917768

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.89-fb@1526252 13f79535-47bb-0310-9956-ffa450edef68