BIS-51 / SP-175: Test cleanup

...isd/openbis/systemtest/AssignDataSetToExperimentTest.java

...sx/cisd/openbis/systemtest/AssignDataSetToSampleTest.java

...isd/openbis/systemtest/AssignExperimentToProjectTest.java

...msx/cisd/openbis/systemtest/AssignProjectToSpaceTest.java

...cisd/openbis/systemtest/AssignSampleToExperimentTest.java

...emsx/cisd/openbis/systemtest/AssignSampleToSpaceTest.java

.../openbis/systemtest/UnassignSampleFromExperimentTest.java

.../cisd/openbis/systemtest/UnassignSampleFromSpaceTest.java

...cisd/openbis/systemtest/UpdateDataSetContainmentTest.java

...msx/cisd/openbis/systemtest/UpdateDataSetParentsTest.java

.../cisd/openbis/systemtest/UpdateSampleContainmentTest.java

...emsx/cisd/openbis/systemtest/UpdateSampleParentsTest.java

.../openbis/systemtest/base/auth/BasicAuthorizationRule.java

...emsx/cisd/openbis/systemtest/base/auth/GuardedDomain.java

...msx/cisd/openbis/systemtest/base/auth/InstanceDomain.java

...stemsx/cisd/openbis/systemtest/base/auth/SpaceDomain.java

openbis/sourceTest/java/tests_system_cleandb.xml

...eTest/java/tests_system_cleandb_without_authorization.xml