Fix the migration path for pre-3.8 LogDevs. #646
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Log Devices pre-3.8 did not contain a superblock for the rollback metadata. We were not handling this absense correctly and crashing when loading a <=3.7.x homestore drive.
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Log Devices pre-3.8 did not contain a superblock for the rollback metadata. We were not handling this absense correctly and crashing when loading a <=3.7.x homestore drive.