message: Change log level for invalid rollback of ledger secrets
diff: @@ -271,7 +271,7 @@ namespace ccf
  if (version < ledger_secrets.begin()->first)
  {
  - LOG_FAIL_FMT(
  + LOG_DEBUG_FMT(
  "Cannot rollback ledger secrets at {}: first secret is at {}",
  version,
  ledger_secrets.begin()->first);
  