Migrate dev repo to rdu3

CentOS Infra issue/request

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Issue Type

[] Issue - problem with something that was working
[] Feature Request - something you'd like us to add/modify/change
Task - mostly used by CentOS Infra team for day-to-day operations or bigger plans

Description

Almost forgotten (as only used for dev environment, and so when testing new ansible roles/changes) but discovered through #1814 (closed) : we have to migrate one small VM that offers public dev repo (populated from candidate infra tags so that our *.dev.centos.org machines can retrieve packages.

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