Add session_gc_maxlifetime php.ini option

defaults/main.yml

@@ -78,3 +78,4 @@ phpinidefault:
   upload_max_filesize: 64M
   memory_limit: 128M
   date_timezone: UTC
+  session_gc_maxlifetime: 1440

templates/php-fpm/php.ini.j2

@@ -1422,7 +1422,7 @@ session.gc_divisor = 1000
 ; After this number of seconds, stored data will be seen as 'garbage' and
 ; cleaned up by the garbage collection process.
 ; http://php.net/session.gc-maxlifetime
-session.gc_maxlifetime = 1440
+session.gc_maxlifetime = {{ phpini.session_gc_maxlifetime }}
 
 ; NOTE: If you are using the subdirectory option for storing session files
 ;       (see session.save_path above), then garbage collection does *not*