disable user activation on Main since sending mails is broken

and will get probably fixed tomorrow

production/group_vars/galaxyservers.yml

@@ -199,7 +199,7 @@ base_app_main: &BASE_APP_MAIN
   instance_resource_url: "http://wiki.galaxyproject.org/Support"
   blacklist_file: "{{ galaxy_config_dir }}/disposable_email_blacklist.conf"
   registration_warning_message: "Please register only one account. The {{ galaxy_instance_hostname }} service is provided free of charge and has limited computational and data storage resources. <strong>Registration and usage of multiple accounts is tracked and such accounts are subject to termination and data deletion.</strong>"
-  user_activation_on: "True"
+  user_activation_on: "False"
   activation_grace_period: 6
   inactivity_box_content: "Your account has not been activated yet.  Feel free to browse around and see what's available, but you won't be able to upload data or run jobs until you have verified your email address."
   wiki_url: "http://wiki.galaxyproject.org/"