Add new functionality to load tables without being associated to a network element

Change-Id: I70ebfe961e666d9994350eb32c6632ee5c08de0d
New seperated tasks for importing data table and merging two data tables, also tests modified accordingly

Change-Id: I04413d3c72d8a1bc44a0e510dcd09393bb66eeee
Add several improvements to merge tables tool and import tables tool. Fixed problem to load and import a table when the file is already known. Fixes #1243 bug to load a table at from command line at startup

Change-Id: I41bb2b552988db5ef438d425f4bf84a3049f47e3
Merge branch 'feature/newMergeTool' into develop