[LMS-1032] DAO tests;

.../ch/systemsx/cisd/openbis/generic/shared/dto/GroupPE.java

...ch/systemsx/cisd/openbis/generic/shared/dto/SamplePE.java

...ystemsx/cisd/openbis/generic/shared/dto/VocabularyPE.java

...sd/openbis/generic/server/dataaccess/db/GroupDAOTest.java

.../openbis/generic/server/dataaccess/db/ProjectDAOTest.java

...bis/generic/server/dataaccess/db/PropertyTypeDAOTest.java

...d/openbis/generic/server/dataaccess/db/SampleDAOTest.java

...enbis/generic/server/dataaccess/db/VocabularyDAOTest.java