Merge branch 'ab/test-lib-updates'

Test clean-up. * ab/test-lib-updates: test-lib: split up and deprecate test_create_repo() test-lib: do not show advice about init.defaultBranch under --verbose test-lib: reformat argument list in test_create_repo() submodule tests: use symbolic-ref --short to discover branch name test-lib functions: add --printf option to test_commit describe tests: convert setup to use test_commit test-lib functions: add an --annotated option to "test_commit" test-lib-functions: document test_commit --no-tag test-lib-functions: reword "test_commit --append" docs test-lib tests: remove dead GIT_TEST_FRAMEWORK_SELFTEST variable test-lib: bring $remove_trash out of retirement