Git commits in Moodle 3.6.6 by Netica Informática

commit 4639c08029f5d0e68c80471934aa32ec18b74d07
Author: Netica Informática <neticainformatica@gmail.com>
Date:   Sat, 17 Aug 2019 00:03:50 +0800
Tag:    v3.6.6

MDL-66139 cachestore_redis: Fix connection problems when port is not set