message: More optimized producer_r1_key test
diff: @@ -1203,8 +1203,12 @@ BOOST_AUTO_TEST_CASE(producer_r1_key) { try {
  // Add signing key to the tester object, so it can sign with the correct key
  chain.block_signing_private_keys[producer_r1_pub_key] = producer_r1_priv_key;
  - // Produce blocks, it should not throw any exception
  - BOOST_CHECK_NO_THROW(chain.produce_blocks(1000));
  + // Wait until the current round ends
  + chain.produce_blocks_until_end_of_round();
  +
  + // The next set of producers will be producing starting in the middle of next round
  + // This round should not throw any exception
  + BOOST_CHECK_NO_THROW(chain.produce_blocks_until_end_of_round());
  } FC_LOG_AND_RETHROW() }
  