test-extension: make the test compatible with chg This test fails when run with chg. This commit just makes the test chg aware by fixing the output of some of the tests. Test Plan: Ran the test 'test-extension.t' with and without '--chg' option. Differential Revision: https://phab.mercurial-scm.org/D1160

hghave: disable demandimport when chg is running Chg disables demandimport on purpose for performance wins and therefore, it probably makes sense to indicate that demandimport is disabled when chg is running. Test Plan: Ran all the tests. Differential Revision: https://phab.mercurial-scm.org/D1161

test-show: make it compatible with chg The show extension reads `commands.show.aliasprefix` config in its `extsetup` and that causes issues with chg. This patch adds that config item to chg confighash to solve the issue. Test Plan: `run-tests.py -l --chg test-show.t` Differential Revision: https://phab.mercurial-scm.org/D1158

templater: use pycompat.sysbytes to bytes-ify some __name__ attrs Spotted by yuya in review of e87e62b7fc0b. Differential Revision: https://phab.mercurial-scm.org/D1145