The minor update procedure has been suggesting the execution of the
online db migrations step for few releases already, by the execution
of the openstack overcloud external-update run --tags online_upgrade.
However, this command has never executed any task at all as the
online_upgrade tasks belong to the external_upgrade_tasks section.
Instead of changing the interface in all releases by modifying the docs
let's just fix this in the code.
Change-Id: I4453e7c755cccc52bb135a14be1b04fdea53de6b
Closes-Bug: #1900467
d18209799c