Unix socket example

[ArtemGr]

Unix sockets are faster and less resource-demanding at least on Linux.
We should be able to use them with SCGI.

• Roll out a development version of Apache somewhere, setup an IDE (Netbeans?).
• Investigate, debug and if necessary fix the file socket mode in mod_proxy.
• Submit a bug report / patch if necessary to Apache.
• Write a file socket example.
• Document the Apache options / patches needed to make it work.

[ArtemGr]

I've tried it a month or two back but had a problem in that Apache seems to be lacking a proper support for SCGI file sockets. Since I'm using Apache I can't properly test this thus far.