rpc: Extract GetWalletNameFromJSONRPCRequest from GetWalletForJSONRPCRequest
rpc: Extract GetWalletNameFromJSONRPCRequest from GetWalletForJSONRPCRequest

chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin