Release 0.9.1 (#3595)

* fix requirements.txt surgery in response to shipping certbot-nginx (#3585)

* Make --quiet reduce the logging level (#3593)

* reduce logging level and ignore verbose flags in quiet mode

* Simplify setup_logging parameters

The extra parameters were there in the past when the letsencrypt-renewer was a
separate executable that also used this function. This is cruft that can be
removed.

* Add basic tests for setup_logging

* Release 0.9.1

* Bump version to 0.10.0

docs/cli-help.txt

@@ -307,15 +307,6 @@ plugins:
   --webroot             Obtain certs by placing files in a webroot directory.
                         (default: False)
 
-nginx:
-  Nginx Web Server plugin - Alpha
-
-  --nginx-server-root NGINX_SERVER_ROOT
-                        Nginx server root directory. (default: /etc/nginx)
-  --nginx-ctl NGINX_CTL
-                        Path to the 'nginx' binary, used for 'configtest' and
-                        retrieving nginx version number. (default: nginx)
-
 standalone:
   Spin up a temporary webserver
 
@@ -328,6 +319,15 @@ manual:
                         Automatically allows public IP logging. (default:
                         False)
 
+nginx:
+  Nginx Web Server plugin - Alpha
+
+  --nginx-server-root NGINX_SERVER_ROOT
+                        Nginx server root directory. (default: /etc/nginx)
+  --nginx-ctl NGINX_CTL
+                        Path to the 'nginx' binary, used for 'configtest' and
+                        retrieving nginx version number. (default: nginx)
+
 webroot:
   Place files in webroot directory