Tramp code cleanup

Tramp code cleanup

* lisp/net/tramp.el (tramp-signal-hook-function)
(tramp-handle-access-file, tramp-handle-copy-directory)
(tramp-handle-directory-files, tramp-handle-file-local-copy)
(tramp-handle-insert-file-contents, tramp-handle-load):
* lisp/net/tramp-adb.el (tramp-adb-handle-directory-files-and-attributes)
(tramp-adb-handle-make-directory)
(tramp-adb-handle-file-local-copy, tramp-adb-handle-copy-file)
(tramp-adb-handle-rename-file):
* lisp/net/tramp-crypt.el (tramp-crypt-do-copy-or-rename-file)
(tramp-crypt-handle-directory-files)
(tramp-crypt-handle-make-directory):
* lisp/net/tramp-gvfs.el (tramp-gvfs-dbus-event-error)
(tramp-gvfs-do-copy-or-rename-file)
(tramp-gvfs-handle-make-directory):
* lisp/net/tramp-rclone.el (tramp-rclone-do-copy-or-rename-file)
(tramp-rclone-handle-directory-files):
* lisp/net/tramp-sh.el (tramp-sh-handle-make-symbolic-link)
(tramp-sh-handle-directory-files-and-attributes)
(tramp-sh-handle-file-name-all-completions)
(tramp-sh-handle-copy-directory, tramp-do-copy-or-rename-file)
(tramp-sh-handle-make-directory)
(tramp-sh-handle-file-local-copy)
(tramp-sh-inotifywait-process-filter):
* lisp/net/tramp-smb.el (tramp-smb-handle-copy-directory)
(tramp-smb-handle-copy-file, tramp-smb-handle-directory-files)
(tramp-smb-handle-file-local-copy)
(tramp-smb-handle-make-directory, tramp-smb-handle-rename-file):
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-do-copy-or-rename-file):
Unify error report.

* lisp/net/tramp-adb.el (tramp-adb-file-name-handler): Sync args
with other `tramp-*-file-name-handler'.

* lisp/net/tramp-compat.el (tramp-error): Declare.
(tramp-compat-file-missing): New defsubst.

* lisp/net/tramp-gvfs.el (tramp-gvfs-do-copy-or-rename-file):
Handle volatile files.
(tramp-gvfs-set-attribute): New defun.
(tramp-gvfs-handle-set-file-modes)
(tramp-gvfs-handle-set-file-times)
(tramp-gvfs-handle-set-file-uid-gid): Use it.

* lisp/net/tramp-sh.el (tramp-do-copy-or-rename-file):
Use `msg-operation'.

* lisp/net/tramp-smb.el (tramp-smb-handle-insert-directory):
Remove superfluous `format:
(tramp-smb-maybe-open-connection): Simplify loop.

* lisp/net/tramp.el (tramp-handle-file-truename): Drop volume letter from
symlinked files.

* test/lisp/net/tramp-tests.el (tramp--test-gdrive-p): New defun.
(tramp--test-nextcloud-p): Remove.
(tramp-test40-special-characters-with-ls): Do not skip on MS Windows.
(tramp-test41-utf8): Skip if needed.