tests/test-gendoc-el.t

phabricator: pass ui into readurltoken instead of passing repo

The goal of this series is to make `hg debugcallconduit` work outside of a hg
repo.

This patch, removes requirement of repo object from readurltoken as we only need
ui there. It also updates the callers to pass in ui instead of repo.

Differential Revision: https://phab.mercurial-scm.org/D6497

#require docutils gettext

  $ $TESTDIR/check-gendoc el
  checking for parse errors