MFC r359232:

pw: do not removed home directories if not owned

When deleting a user, if its home directory does not belong to it, it should
not be removed. This is the promise that the manpage makes, the tool should
ensure that it respects that promise.

Add a regression test about it

PR: 244967
Submitted by: Eric Hanneken <eric@erichanneken.com>

MFC r326276:

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

iDo not try to delete the home of the user if is is not a directory for example
"/dev/null"

PR: 211195
Submitted by: rday <ryan@ryanday.net>
Reported by: eniorm <eniorm@gmail.com>
Approved by: re (kib)