This patch is adding the configuration of the number of workers,
and the size of the listen queue in Debian, which uses uwsgi to run
Swift. Therefore, this patch adds new swift_proxy_uwsgi_config,
swift_account_uwsgi_config, and swift_container_uwsgi_config, providers
as well as e new swift::wsgi::uwsgi_proxy, swift::wsgi::uwsgi_container,
and swift::wsgi::uwsgi_account classes.
Change-Id: Ib18f3479bc6a4513a7b3d823cda480c4ace2f2c0