roles/aurweb: Improve the defaults file

Made some changes to the defaults file to make the installation work.
Moved the db password to the vault, added the cache and limits variables
and also changed the username back to aur.

roles/aurweb/defaults/main.yml

@@ -11,7 +11,11 @@ aurweb_version: 'live'
 aurweb_db: 'aur'
 aurweb_db_host: 'localhost'
 aurweb_db_user: 'aur'
-aurweb_db_password: 'aur'
 
-aurweb_user: 'aurweb'
+aurweb_user: 'aur'
 aurweb_socket: '/run/php-fpm/{{aurweb_user}}.socket'
+
+aurweb_cache: 'apc'
+aurweb_cache_pkginfo_ttl: '86400'
+aurweb_request_limt: '4000'
+aurweb_window_length: '86400'
\ No newline at end of file