Merge branch 'ep/avoid-test-a-o'
Update tests and scripts to avoid "test ... -a ...", which is often
more error-prone than "test ... && test ...".
Squashed misconversion fix-up into git-submodule.sh updates.
* ep/avoid-test-a-o:
git-submodule.sh: avoid "echo" path-like values
git-submodule.sh: avoid "test <cond> -a/-o <cond>"
t/test-lib-functions.sh: avoid "test <cond> -a/-o <cond>"
t/t9814-git-p4-rename.sh: avoid "test <cond> -a/-o <cond>"
t/t5538-push-shallow.sh: avoid "test <cond> -a/-o <cond>"
t/t5403-post-checkout-hook.sh: avoid "test <cond> -a/-o <cond>"
t/t5000-tar-tree.sh: avoid "test <cond> -a/-o <cond>"
t/t4102-apply-rename.sh: avoid "test <cond> -a/-o <cond>"
t/t0026-eol-config.sh: avoid "test <cond> -a/-o <cond>"
t/t0025-crlf-auto.sh: avoid "test <cond> -a/-o <cond>"
t/lib-httpd.sh: avoid "test <cond> -a/-o <cond>"
git-rebase--interactive.sh: avoid "test <cond> -a/-o <cond>"
git-mergetool.sh: avoid "test <cond> -a/-o <cond>"
git-bisect.sh: avoid "test <cond> -a/-o <cond>"
contrib/examples/git-resolve.sh: avoid "test <cond> -a/-o <cond>"
contrib/examples/git-repack.sh: avoid "test <cond> -a/-o <cond>"
contrib/examples/git-merge.sh: avoid "test <cond> -a/-o <cond>"
contrib/examples/git-commit.sh: avoid "test <cond> -a/-o <cond>"
contrib/examples/git-clone.sh: avoid "test <cond> -a/-o <cond>"
check_bindir: avoid "test <cond> -a/-o <cond>"