Fixes #2429. Apply space as separator for columns list when exporting table. Make sure that the space is also considered as a separator when importing column lists.

Change-Id: I7835f4aa30b409545f1341d50c3b4bb7f8229d4e
References #2429. Fixing issue related to exporting tables for two different cases (sessions and tables)

Change-Id: Iff56e207dbef5f7e679625ac76eefe43c740aa17