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phabricator: make `hg phabread` work outside of a repository

Authored by mharbison72.

Description

phabricator: make hg phabread work outside of a repository

This is similar to 16312ea45a8b and 2513f0f70a26- we don't need a repo, but will
load .hg/hgrc if inside one.

Differential Revision: https://phab.mercurial-scm.org/D8214