HBASE-10518 DirectMemoryUtils.getDirectMemoryUsage spams when none is configured

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1568419 13f79535-47bb-0310-9956-ffa450edef68
Set version in branch 0.98 to 0.98.1-SNAPSHOT

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1568504 13f79535-47bb-0310-9956-ffa450edef68
Set version in branch 0.98 to 0.98.1-SNAPSHOT; Add missing change to hbase-client

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1568505 13f79535-47bb-0310-9956-ffa450edef68