Splits hbase storage code base

The hbase storage file have three different kind of things
* The Connection class
* The In-Memory implementation of HBase
* The a list of helper methods

This change splits this three things into separate files

Partial implements blueprint dedicated-alarm-database
Co-Authored-By: Ala Rezmerita <ala.rezmerita@cloudwatt.com>

Change-Id: I6453dc7795fb24d8ea773b129874e7936befae47
Merge "Splits hbase storage code base"