CHANGELOG_BEGIN
- [Sandbox] The ledger API server will now always use the most recent ledger configuration.
  Until a ledger configuration is read from the ledger, command submissions will fail with the UNAVAILABLE error.
CHANGELOG_END

In kvutils, the first ledger configuration change needs
to have a generation one higher than the one returned
by getLedgerInitialConditions().

Remove initial config writing from sandbox as it's now written by the ledger API server