properly handle init queue for hierarchical paths #115
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This PR fixes a bug where roles names with hierarchical paths caused a panic on reloads of the backend.
Roles can be defined with hierarchical paths, e.g. "foo/bar/baz". Howerver, the storage.List() call to the top-level static role path will only return the top-level keys in the hierarchy. So we perform a non-recursive breadth-first search through all the keys returned from storage.List(). If a given node points to a static role, we append to the return slice and use that slice to initialize the queue.
Closes hashicorp/vault#27907
Closes #114