Added netlower chisel script.

Sample Output:

```
$ sysdig -c netlower 1
TIME                    PROCESS      TYPE     LATENCY(ms)  SOCKET
2014-05-04 18:59:19.505 ping         recvmsg  26           192.168.1.3->74.125.236.200
2014-05-04 18:59:20.509 ping         recvmsg  29           192.168.1.3->74.125.236.200
2014-05-04 18:59:21.508 ping         recvmsg  26           192.168.1.3->74.125.236.200
2014-05-04 18:59:22.510 ping         recvmsg  26           192.168.1.3->74.125.236.200
2014-05-04 18:59:23.511 ping         recvmsg  26           192.168.1.3->74.125.236.200
```