Fixes issue with relationship delete cache invalidation, where recovered commands would fail to
 properly update their node's relationship chain position

RelationshipCommand now on execute will, when recovered, read the current store version and use
 that to invalidate/update the cache.
Removes methods from RelatioshipCommand that were not used and since this change potentially misleading
Fixes some formatting in RelationshipCommand

This is a cherry-pick from 8d14dcd4d71e450ed744266b217f514a548855bf