[PATCH STABLE] run-tests: fix permission to clean up unreadable directories

[Augie Fackler]

On Mon, Dec 17, 2018 at 09:00:56PM +0900, Yuya Nishihara wrote:
> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1545047169 -32400
> #      Mon Dec 17 20:46:09 2018 +0900
> # Branch stable
> # Node ID 0b83681014bfc4cde7f4f43fc05e9345f4645032
> # Parent  120ecb17242b4edd5a14d6abb094df7d97d78835
> run-tests: fix permission to clean up unreadable directories

queued for stable, thanks