[LMS-654] change: - Clean DAOs.

...is/generic/server/business/bo/AbstractBusinessObject.java

...x/cisd/openbis/generic/server/dataaccess/IDAOFactory.java

...cisd/openbis/generic/server/dataaccess/db/DAOFactory.java

...s/generic/server/dataaccess/db/EntityPropertyTypeDAO.java

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

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

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

.../cisd/openbis/generic/server/dataaccess/db/SampleDAO.java

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

...s/generic/server/dataaccess/db/SamplePropertyDAOTest.java