Merge pull request EOSIO#2165 from larryk85/fix/create_account_fails

Fix eos EOSIO#2160

Merge pull request EOSIO#1986 from EOSIO/bios-use-well-known-key

restore the default producer key pair for the bios producer

Merge pull request EOSIO#1880 from taokayan/txn_test_plugin

fix txn_test_gen_plugin for stress test(DAWN-562)