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phabricator: allow multiple DREVSPEC args to phabread|phabimport|phabupdate

Authored by mharbison72.

Description

phabricator: allow multiple DREVSPEC args to phabread|phabimport|phabupdate

Per Augie's request. Like regular revsets, the result is the union of all given
specs. Unlike regular revsets, these don't resolve in parent -> child order,
and should be specified as such on the command line.

This change invalidated a previous test using an empty hg phabread, so it has
been switched to hg debugcallconduit to preserve that coverage.

Differential Revision: https://phab.mercurial-scm.org/D8233