Add test for multiwallet batch RPC calls
Add test for multiwallet batch RPC calls

Tests bug reported in https://github.com/bitcoin/bitcoin/issues/11257

Github-Pull: #11277
Rebased-From: 4526d21e52aa94f12121fcf01047c04f82c4990a

tecnovert/particl-core,digibyte/digibyte,particl/particl-core,UFOCoins/ufo,digibyte/digibyte,digibyte/digibyte,digibyte/digibyte,gjhiggins/vcoincore,tecnovert/particl-core,particl/particl-core,particl/particl-core,UFOCoins/ufo,particl/particl-core,particl/particl-core,romanornr/viacoin,UFOCoins/ufo,gjhiggins/vcoincore,UFOCoins/ufo,gjhiggins/vcoincore,romanornr/viacoin,tecnovert/particl-core,gjhiggins/vcoincore,gjhiggins/vcoincore,romanornr/viacoin,tecnovert/particl-core,tecnovert/particl-core,digibyte/digibyte,romanornr/viacoin,UFOCoins/ufo,particl/particl-core,gjhiggins/vcoincore,digibyte/digibyte,romanornr/viacoin,UFOCoins/ufo,romanornr/viacoin,tecnovert/particl-core