SP-1060, SWE-36: test_3v.py and all necessary stuff added. Some refactorings

integration-tests/source/systemtest/testcase.py

integration-tests/source/systemtest/util.py

integration-tests/sourceTest/systemtest/util_test.py

...penbis1/1/dss/drop-boxes/image-analysis/plugin.properties

...gins/openbis1/1/dss/drop-boxes/raw-data/plugin.properties

...ore-plugins/openbis2/1/dss/drop-boxes/a/plugin.properties

...tion-tests/templates/test_3v/datamover1/data-completed.sh

...ration-tests/templates/test_3v/dummy-img-analyser/log.txt

...gration-tests/templates/test_3v/dummy-img-analyser/run.sh

...ation-tests/templates/test_3v/dummy-img-analyser/start.sh

...ration-tests/templates/test_3v/dummy-img-analyser/stop.sh

...tion-tests/templates/test_3v/openbis_test_3v_openbis1.sql

integration-tests/test_3v.py

integration-tests/test_screening.py

integration-tests/test_yeastx.py