BIS-183 Make SegmentedStoreUtils.getSharesWithDataSets() to fetch the datasets lazily.

...x/cisd/etlserver/plugins/SegmentedStoreShufflingTask.java

...x/cisd/etlserver/postregistration/EagerShufflingTask.java

...er/plugins/standard/AbstractArchiverProcessingPlugin.java

...openbis/dss/generic/shared/utils/SegmentedStoreUtils.java

...systemsx/cisd/openbis/dss/generic/shared/utils/Share.java

...x/cisd/openbis/dss/generic/shared/utils/ShareFactory.java

...x/cisd/openbis/dss/generic/shared/utils/SharesHolder.java

...bis/dss/generic/shared/utils/SegmentedStoreUtilsTest.java