SP-332, BIS-225: feature implemented and partially tested

.../server/openbisauth/OpenBISAuthenticationInterceptor.java

...x/cisd/openbis/dss/generic/shared/DataSourceProvider.java

.../openbis/dss/generic/shared/DefaultDataSourceFactory.java

.../cisd/openbis/dss/generic/shared/IDataSourceProvider.java

...d/openbis/dss/generic/shared/SimpleDataSourceFactory.java

datastore_server/source/java/dssApplicationContext.xml

...ver/openbisauth/OpenBISAuthenticationInterceptorTest.java

...rce/java/ch/systemsx/cisd/dbmigration/DatabaseEngine.java

.../cisd/dbmigration/SimpleDatabaseConfigurationContext.java

...a/ch/systemsx/cisd/openbis/generic/server/ETLService.java

...er/dataaccess/DataStoreServerBasedDataSourceProvider.java

...penbis/generic/server/dataaccess/IDataSourceProvider.java

...eneric/server/dataaccess/IDataStoreDataSourceManager.java

...cisd/openbis/generic/shared/dto/DataSourceDefinition.java

.../openbis/generic/shared/dto/DataSourceWithDefinition.java

.../cisd/openbis/generic/shared/dto/DataStoreServerInfo.java

.../cisd/openbis/generic/shared/util/IDataSourceFactory.java

openbis/source/java/genericApplicationContext.xml

.../systemsx/cisd/openbis/generic/server/ETLServiceTest.java

...ataaccess/DataStoreServerBasedDataSourceProviderTest.java