Add support for inspecting socket options

The bcc tools already provide a wide range of utilities to investigate TCP connections and sockets. However, I wasn't able to find a way to trace the socket options of a running process. It would be great if [`solisten`](https://github.com/iovisor/bcc/blob/master/tools/solisten.py) or a new tool could show in a column the socket options of each socket.

Start with tools/solisten.py, linked in the issue, and review how it discovers and displays sockets. Define whether the existing tool or a new tool should expose socket options, then verify that the output includes those options for each socket and remains useful for a running process.

Written by the indexing model from the issue text.