Merge branch 'jk/branch-l-0-deprecation'

The "-l" option in "git branch -l" is an unfortunate short-hand for "--create-reflog", but many users, both old and new, somehow expect it to be something else, perhaps "--list". This step warns when "-l" is used as a short-hand for "--create-reflog" and warns about the future repurposing of the it when it is used. * jk/branch-l-0-deprecation: branch: deprecate "-l" option t: switch "branch -l" to "branch --create-reflog" t3200: unset core.logallrefupdates when testing reflog creation