caddy-frontend: Drop server-admin

This option is not advertised and it is not needed at all in Caddy
configuration.

software/caddy-frontend/buildout.hash.cfg

@@ -14,7 +14,7 @@
 # not need these here).
 [template]
 filename = instance.cfg.in
-md5sum = 345b3a9b12241448913ec3ec8f929d51
+md5sum = d649e128d36cf76f870c189c53985569
 
 [template-common]
 filename = instance-common.cfg.in
@@ -22,7 +22,7 @@ md5sum = c801b7f9f11f0965677c22e6bbe9281b
 
 [template-apache-frontend]
 filename = instance-apache-frontend.cfg.in
-md5sum = 2f8f0e30d9703437555e57e9410b1bbf
+md5sum = 64fb8005a62f0a3a9987de2e336b68e1
 
 [template-apache-replicate]
 filename = instance-apache-replicate.cfg.in

software/caddy-frontend/instance-apache-frontend.cfg.in

@@ -198,7 +198,6 @@ extra-context =
     key httpd_home software-release-path:caddy-location
     key httpd_mod_ssl_cache_directory caddy-directory:mod-ssl
     key instance_home buildout:directory
-    key server_admin configuration:server-admin
     key login_certificate ca-frontend:cert-file
     key login_key ca-frontend:key-file
     key login_ca_crt ca-custom-frontend:rendered

software/caddy-frontend/instance.cfg.in

@@ -72,7 +72,6 @@ configuration.port = 4443
 configuration.plain_http_port = 8080
 configuration.plain_nginx_port = 8081
 configuration.nginx_port = 9443
-configuration.server-admin = admin@example.com
 # BBB: apache_custom_https and apache_custom_http
 configuration.apache_custom_https = ""
 configuration.apache_custom_http = ""