FLUME-2314. Upgrade to Mapdb 0.9.9
FLUME-2314. Upgrade to Mapdb 0.9.9

(Hari Shreedharan via Jarek Jarcec Cecho)

szaboferee/flume,tmgstevens/flume,iaiengxia/flume,iaiengxia/flume,iaiengxia/flume,tmgstevens/flume,tinawenqiao/flume,szaboferee/flume,tinawenqiao/flume,tinawenqiao/flume,szaboferee/flume,iaiengxia/flume,szaboferee/flume,tinawenqiao/flume,tmgstevens/flume,tmgstevens/flume