Git commits in Moodle 3.11.x by Srdjan

commit 99e536fc4c9eb5f161a8759e9ff1bfc3f4edf319
Author: Srdjan <srdjan@catalyst.net.nz>
Date:   Wed, 10 Mar 2021 09:34:31 +0800
Tag:    v3.11.0-beta

MDL-70965 core_dml: read_slave - mock db handles as resources