Still fixes for Tramp directory-files-*

Still fixes for Tramp directory-files-*

* lisp/net/tramp.el (tramp-handle-directory-files):
* lisp/net/tramp-adb.el
(tramp-adb-handle-directory-files-and-attributes): Fix COUNT.

* lisp/net/tramp-crypt.el (tramp-crypt-handle-directory-files):
Implement COUNT.

* lisp/net/tramp-gvfs.el (tramp-gvfs-dbus-byte-array-to-string):
* lisp/net/tramp-integration.el (tramp-eshell-directory-change):
Use `nbutlast'.

* lisp/net/tramp-rclone.el (tramp-rclone-handle-delete-directory)
(tramp-rclone-handle-delete-file): Reorder cache flushing.
(tramp-rclone-handle-directory-files):
Use `tramp-compat-directory-files'.

* lisp/net/tramp-sh.el (tramp-sh-handle-directory-files-and-attributes):
Fix NOSORT and COUNT.

* lisp/net/tramp-smb.el (tramp-smb-handle-directory-files): Fix NOSORT.

* test/lisp/net/tramp-tests.el (tramp--test-share-p): New defun.
(tramp-test05-expand-file-name-relative): Use it.
(tramp-test16-directory-files)
(tramp-test19-directory-files-and-attributes): Strengthen test.
(tramp-test20-file-modes): Simplify check.