net: refactor packet handling.

lib/net/packets.js

@@ -10,18 +10,13 @@
 var common = require('./common');
 var util = require('../utils/util');
 var assert = require('assert');
-var crypto = require('../crypto/crypto');
-var ec = require('../crypto/ec');
 var Bloom = require('../utils/bloom');
 var bip152 = require('./bip152');
 var NetAddress = require('../primitives/netaddress');
-var Coin = require('../primitives/coin');
 var Headers = require('../primitives/headers');
 var InvItem = require('../primitives/invitem');
 var MemBlock = require('../primitives/memblock');
 var MerkleBlock = require('../primitives/merkleblock');
-var Outpoint = require('../primitives/outpoint');
-var Output = require('../primitives/output');
 var TX = require('../primitives/tx');
 var BufferReader = require('../utils/reader');
 var StaticWriter = require('../utils/staticwriter');