NXCALS-1616 fix overlap + tune Hbase + minor refactors
#Merge request template @acc-logging-team - please have a look for approval.
Edit: as of 12h00 there are no data-losses or duplicates on the Hbase - Hdfs boundary. Removing WIP.
After 12h00 today (17.05.2018) we will hit the Hbase - Hdfs split boundary. If there are no data-losses past that point I assume the patch and refactors are correct.
Closes NXCALS-1615
Edited by Kamil Krzysztof Krynicki