[PDI-11582] HDP 2.1 Linux Shim Support (Unsecure)

Remove upsupported hdp20 shim
[BACKLOG-350] Fixes the tests so that the reducers are closed and their buffer empties before the assertions are done.
Merge pull request #239 from pavel-sakun/PDI-11582-remove-hdp20

[PDI-11582] HDP 2.1 Linux Shim Support (Unsecure)
Merge pull request #246 from lucboudreau/master

[BACKLOG-350] Fixes the tests so that the reducers are closed and their ...
[PDI-11049] PDI fails to connect to different Hive databases other that "default"