Implements uwsgi_pass + static assets support

[ghost]

This patch implements the support of uWSGI UNIX sockets into the ansible-nginx role and it does support as well static assets.

There's an example of usage in a playbook :

- role: nginx
  nginx_simple_uwsgi_passes:
    - server_name: example.org
      socket_path: /var/run/redmine.sock
      ssl_only: no
      static_root: /usr/share/redmine/public/
      static_paths:
        - /favicon.ico
        - /stylesheets/
        - /javascripts/
        - /images/
        - /plugin_assets/
        - /help/
        - /themes/

The generated virtual host will looks like this :

server {
    listen 80;
    listen 443 ssl;
    server_name example.org;

    include snippets/snakeoil.conf;

    location /favicon.ico {
        alias /usr/share/redmine/public//favicon.ico;
    }
    location /stylesheets/ {
        alias /usr/share/redmine/public//stylesheets/;
    }
    location /javascripts/ {
        alias /usr/share/redmine/public//javascripts/;
    }
    location /images/ {
        alias /usr/share/redmine/public//images/;
    }
    location /plugin_assets/ {
        alias /usr/share/redmine/public//plugin_assets/;
    }
    location /help/ {
        alias /usr/share/redmine/public//help/;
    }
    location /themes/ {
        alias /usr/share/redmine/public//themes/;
    }

    error_log /var/log/nginx/inframisc-prod01_error.log;
    access_log /var/log/nginx/inframisc-prod01_access.log;

    location / {
        uwsgi_pass  unix:/var/run/redmine.sock;
        include     uwsgi_params;
    }
}

In hope that will be merged. Thank you very much and have a great day !