Merge branch 'jk/autoident-test'

Fix test breakages by a builder who does not have a valid user name in his /etc/password entry. * jk/autoident-test: t7502: test early quit from commit with bad ident t7502: handle systems where auto-identity is broken t7502: drop confusing test_might_fail call t7502: narrow checks for author/committer name in template t7502: properly quote GIT_EDITOR t7502: clean up fake_editor tests