LMS-2460 fix: allow to update contained samples

...eric/server/business/bo/AbstractSampleBusinessObject.java

...emsx/cisd/openbis/generic/shared/basic/dto/NewSample.java

.../cisd/openbis/generic/shared/basic/dto/UpdatedSample.java

...enbis/generic/shared/dto/identifier/SampleIdentifier.java

...eneric/shared/dto/identifier/SampleIdentifierFactory.java

...msx/cisd/openbis/plugin/generic/server/GenericServer.java

...bis/plugin/generic/server/SampleRegisterOrUpdateUtil.java

...cisd/openbis/plugin/generic/server/GenericServerTest.java