byteify-string: resolve symlink before byteifying
Otherwise the script turns symlinks into regular files.
tests: simplify test-fix-topology.t slightly by using a `(case !)`
Differential Revision: https://phab.mercurial-scm.org/D8283
tests: fix rebase test broken by earlier cleanup
It turns out I broke one of the rebase tests in
dd2833e4d660 (tests:
use drawdag in test-rebase-collapse.t, 2018-03-18) and didn't notice
until now.
Differential Revision: https://phab.mercurial-scm.org/D8277