HBASE-11678 BucketCache ramCache fills heap after running a few hours
HBASE-11678 BucketCache ramCache fills heap after running a few hours -- 0.98 addendum
HBASE-11697 Improve the 'Too many blocks' message on UI blockcache status page (Mikhail Antonov)

Amending-Author: Andrew Purtell <apurtell@apache.org>
HBASE-11701 Start and end of memstore flush log should be on the same level (Esteban Gutierrez)

Amending-Author: Andrew Purtell <apurtell@apache.org>
Merge remote-tracking branch 'remotes/origin/0.98' into 0.98