Adds lower bound to pull mirror scheduling feature

Merged Tiago Botelho requested to merge add-lower-bound-to-pull-mirror-scheduling into master

What does this MR do?

Mirrors are being update too frequently. In order to avoid that we are adding a configurable lower bound on the mirror scheduling component of the feature.

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

#2868 (closed)

Edited by Tiago Botelho