HBASE-10049 Small improvments in region_mover.rb



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HBASE-10005 TestVisibilityLabels fails occasionally

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HBASE-10005 TestVisibilityLabels fails occasionally (addendum)

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HBASE-10056 region_status.rb not adopted to 0.96 api

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HBASE-10057 TestRestoreFlushSnapshotFromClient and TestRestoreSnapshotFromClient fail to finish occasionally

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