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rhg: Propagate permission errors when finding a repository

Authored by SimonSapin.

Description

rhg: Propagate permission errors when finding a repository

The Rust standard library has a Path::is_dir method that returns false
for any I/O error (such as a permission error),
not just "No such file or directory".

Instead add an is_dir function that returns false for non-directories
and for "No such file or directory" errors, but propagates other I/O errors.

Differential Revision: https://phab.mercurial-scm.org/D11230

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