vhost_overwrite option for nginx.ng state

nginx/ng/map.jinja

             'vhost_available': '/etc/nginx/sites-available',
             'vhost_enabled': '/etc/nginx/sites-enabled',
             'vhost_use_symlink': True,
+            'vhost_overwrite': True,
             'pid_file': '/run/nginx.pid',
         },
         'CentOS': {
             'vhost_available': '/etc/nginx/conf.d',
             'vhost_enabled': '/etc/nginx/conf.d',
             'vhost_use_symlink': False,
+            'vhost_overwrite': True,
             'pid_file': '/run/nginx.pid',
             'rh_os_releasever': '$releasever',
             'gpg_check': False,
             'vhost_available': '/etc/nginx/conf.d',
             'vhost_enabled': '/etc/nginx/conf.d',
             'vhost_use_symlink': False,
+            'vhost_overwrite': True,
             'pid_file': '/run/nginx.pid',
             'rh_os_releasever': '$releasever',
             'gpg_check': False,
             'vhost_available': '/etc/nginx/conf.d',
             'vhost_enabled': '/etc/nginx/conf.d',
             'vhost_use_symlink': False,
+            'vhost_overwrite': True,
             'pid_file': '/run/nginx.pid',
             'gpg_check': True,
             'gpg_key': 'http://download.opensuse.org/repositories/server:/http/openSUSE_13.2/repodata/repomd.xml.key'
             'vhost_available': '/etc/nginx/sites-available',
             'vhost_enabled': '/etc/nginx/sites-enabled',
             'vhost_use_symlink': True,
+            'vhost_overwrite': True,
         },
         'Gentoo': {
             'package': 'www-servers/nginx',
             'vhost_available': '/etc/nginx/sites-available',
             'vhost_enabled': '/etc/nginx/sites-enabled',
             'vhost_use_symlink': True,
+            'vhost_overwrite': True,
         },
     }, default='Debian' ),
     'install_from_source': False,

nginx/ng/vhosts_config.sls

     - template: jinja
     - context:
         config: {{ settings.config|json() }}
+    {% if nginx.lookup.vhost_overwrite == False %}
+    - unless:
+      - test -e {{ vhost_curpath(vhost) }}
+    {% endif %}
 {% do vhost_states.append(conf_state_id) %}
 {% endif %}