Fix broken repo config for dockerctl

Previous commit 73db664c16321e2beef1afa679625ac520c1d9b2
incorrectly addresses the problem by populating requirements
list twice with the same key, which was removing repo
volume from being exposed to most containers.

Change-Id: I4926e35827c264850326a59f085259c044a4b838
Related-Bug: #1336771