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200dc084c5
RF change of tablet keyspace starts tablet rebuilds. Even if any of the rebuilds is rolled back (because pending replica was excluded), rf change request finishes successfully. Yet, we are left with not enough replicas. Then, a next new rf change request handler would generate a rebuild of two replicas of the same tablet. Such a transition would not be applied, as we don't allow many pending replicas. An exception would be thrown and the request would be retried infinitely, blocking the topology coordinator. Throw and fail rf change request if there is not enough replicas. The request should be retried later, after the issue is fixed by the mechanism introduced in previous changes.