Feat/volume replication #782
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This PR fixes the issue described in #746 by implementing more checks and cordoning the nodes before Claudie will move Replicas of Volumes. This was tested by migrating the ETDC cluster to multiple new node pools, where each migration resulted in the same state of the database.
There might occasionally be still one issue, which is not severe, as all replicas will migrate with the data correctly. The issue is described as a note in one comment, with the link to the discussion I started with Longhorn maintainers.