Gitlab::Shell methods should take a storage name, not a storage directory

The first argument to methods like Gitlab::Shell#mv_repository should be a storage name, not a storage path.

This issue intersects with ##1106 (closed) and #1108 (closed).

Take extra care with fork_repository, see #1110 (closed)

Edited Mar 26, 2018 by Jacob Vosmaer

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