acmetool: allow configuring different mail address

acmetool/defaults/main.yml

@@ -4,3 +4,6 @@
 acmetool_endpoint: "https://acme-v01.api.letsencrypt.org/directory"
 acmetool_key_type: rsa
 acmetool_rsa_key_size: 4096
+
+acmetool_mail: "{{ adminaddr }}"
+

acmetool/templates/response-file.yml

-"acme-enter-email": "{{adminaddr}}"
+"acme-enter-email": "{{acmetool_mail}}"
 "acme-agreement:{{(lookup('url', acmetool_endpoint, split_lines=False)|from_json)['meta']['terms-of-service']}}": true
 "acmetool-quickstart-choose-server": "{{acmetool_endpoint}}"
 "acmetool-quickstart-choose-method": webroot