Include missing info (#4766)

install/deb/php-fpm/dummy.conf

@@ -16,3 +16,7 @@ listen.mode = 0660
 user = hestiamail
 group = hestiamail
 
+pm = ondemand
+pm.max_children = 4
+pm.max_requests = 4000
+pm.process_idle_timeout = 10s

install/deb/php-fpm/www.conf

@@ -6,7 +6,6 @@ listen.owner = hestiamail
 listen.group = www-data
 listen.mode = 0660
 
-;"hestiamail" user created to prevent users from abusing this config
 user = hestiamail
 group = hestiamail