Enable passing php-options in php-fpm

php-fpm/templates/pool.conf.j2

@@ -11,3 +11,9 @@ pm = ondemand
 pm.max_children = 10
 pm.process_idle_timeout = 10s
 pm.max_requests = 500
+
+{% if fpm_params is defined %}
+{% for key, value in fpm_params.items() %}
+php_value[{{key}}] = {{value}};
+{% endfor %}
+{% endif %}