Merge branch 'jk/t0014-dynamic-deprecated-cmds' into jch

The alias tests in t/t0014-alias.sh have been updated to dynamically
query the list of deprecated commands using 'git
--list-cmds=deprecated' to avoid test failures when running with
WITH_BREAKING_CHANGES in a build directory that contains stale
executables of formerly deprecated commands.

* jk/t0014-dynamic-deprecated-cmds:
  t0014: generate deprecated command names dynamically
  t0014: factor out choice of deprecated commands