Removing access logs on PHP-FPM

Coupled with:

• cern-drupal-distribution!175 (merged)
• cern-drupal-distribution!176 (merged)

Goal: Stop logging unnecessary access logs on php-fpm, these do not present any value but create logs which are stored on ES, occupying needed space.

Example access log from php-fpm:

+0000 "GET /_site/_php-fpm-status" 200
+0000 "GET /_site/_php-fpm-status" 200
+0000 "GET /_site/_php-fpm-status" 200
+0000 "GET /_site/_php-fpm-status" 200
+0000 "GET /index.php" 204