OpenTSDB/tcollector — pull request #181 by casey-green (2014-11-06 22:17:57+00:00)
Title: When parsing port, get last element after ':' instead of second

The token parsed from netstat can take one of two forms: "0 0.0.0.0:6379" and ":::6379". If the for-loop hits the latter line first, then the line throws an exception. This modification ensures that both formats are supported.

I'm running this collector on `Linux 3.2.30-49.59.amzn1.x86_64` EC2 box in AWS.
```
$ netstat --version
net-tools 1.60
netstat 1.42 (2001-04-15)
```

Here is an example output of the netstat command:
```
$ sudo netstat -tnlp
tcp 0 0 0.0.0.0:6379 0.0.0.0:* LISTEN 7621/redis-server *
tcp6 0 0 :::6379 :::* LISTEN 7621/redis-server *
```