Sync with Tramp upstream

Sync with Tramp upstream

* automated/tramp-tests.el (top): Declare `tramp-get-remote-stat'
and `tramp-get-remote-perl'.
(tramp-test06-directory-file-name): Fix docstring and last test.
(tramp-test08-file-local-copy): Extend test.
(tramp-test13-make-directory): Test also PARENTS arg.
(tramp-test17-insert-directory): Do not expect any order in
directory listing.
(tramp--test-adb-p): New defun.
(tramp--test-check-files): Fix doxstring.  Extend tests.
(tramp--test-special-characters): New defun.  Use body from
`tramp-test30-special-characters'.  Adapt check for tramp-adb.el.
(tramp-test30-special-characters): Use it.
(tramp--test-utf8): New defun.  Use body from
`tramp-test31-utf8'.  Add test string.
(tramp-test31-utf8): Use it.
(tramp-test30-special-characters-with-stat)
(tramp-test30-special-characters-with-perl)
(tramp-test30-special-characters-with-ls):
(tramp-test31-utf8-with-stat, tramp-test31-utf8-with-perl)
(tramp-test31-utf8-with-ls): New tests.