Add FreeBSD service script to source control.

src/service_scripts/uwsgi_generate_named_config

+#!/bin/sh
+
+. /etc/rc.subr
+
+name=uwsgi_generate_named_config
+rcvar=uwsgi_generate_named_config_enable
+
+uwsgi_generate_named_config_chdir="/usr/local/etc/nginx/cgi_scripts"
+
+command="/usr/local/bin/uwsgi"
+command_args="--plugin python36 --socket /tmp/generator_cgi.socket --py-programname /usr/local/bin/python3.6 --pythonpath /usr/local/lib/python3.6/site-packages --wsgi-file /usr/local/etc/nginx/cgi_scripts/generator.py --uid 80 --gid 80 --daemonize2 /var/log/uwsgi/generator.log"
+
+load_rc_config $name
+run_rc_command "$1"