Add support for FCGI to tracd (standalone.py)

[josh@…]

By adding fcgi as an option to flup (http, scgi, ajp are already there), trac can easily be used with web servers that don't support spawning an fcgi process (such as nginx) but will communicate with an already running fcgi server. See attached diff.

[josh@…]

Diff to add FCGI server capability to tracd.

[rblank]

I'm not competent to evaluate the validity of this change, but the patch seems simple enough.

[cboos]

Never used fcgi myself either, but that part of the code was managed by mgood, CC'ing him.

[mgood]

LGTM. Applied in r7686.

[sergej.spb@…]

There is some problem when you try to pass for example --hostname=/some/path/fcgi.sock with --protocol=fcgi and without any --port value. I've got an error: socket.gaierror: (-2, 'Name or service not known'). Problem was resolved by replacing on line 240 server_address with options.hostname.

I suspect that such solution isn't the best, but it works for me.