make better show for asm code

Sample:
./bitcoind getrawtransaction  7b80040a18c70f279ac32c7032e69c46aff50ee76398df7babf6f9039ed2561d 1 

in vout->scriptPubKey:
```
"asm" : "1 0424e0d192e25d4eea9ef8ba4f32d45a025d0aa80172c45580762f3d417b6eb804d8d7f3e1ee43863a165ae507bbf67b15bf137ed0d5072f1334e489cb6368c14d 20434e5452505254590000000a000000000000000100000004a817c80000000000 2 OP_CHECKMULTISIG"
```

Better to change:
```
"asm" : "OP_1 0424e0d192e25d4eea9ef8ba4f32d45a025d0aa80172c45580762f3d417b6eb804d8d7f3e1ee43863a165ae507bbf67b15bf137ed0d5072f1334e489cb6368c14d 20434e5452505254590000000a000000000000000100000004a817c80000000000 OP_2 OP_CHECKMULTISIG"
```