Improve Tramp's caching

Improve Tramp's caching

* lisp/net/tramp.el (tramp-handle-add-name-to-file)
(tramp-handle-write-region):
* lisp/net/tramp-adb.el (tramp-adb-handle-make-directory)
(tramp-adb-handle-delete-directory)
(tramp-adb-handle-delete-file, tramp-adb-handle-write-region)
(tramp-adb-handle-set-file-modes)
(tramp-adb-handle-set-file-times, tramp-adb-handle-copy-file)
(tramp-adb-handle-rename-file):
* lisp/net/tramp-gvfs.el (tramp-gvfs-do-copy-or-rename-file)
(tramp-gvfs-handle-delete-directory)
(tramp-gvfs-handle-delete-file)
(tramp-gvfs-handle-make-directory)
(tramp-gvfs-handle-set-file-modes)
(tramp-gvfs-handle-set-file-times, tramp-gvfs-set-file-uid-gid):
* lisp/net/tramp-rclone.el (tramp-rclone-do-copy-or-rename-file)
(tramp-rclone-handle-delete-directory)
(tramp-rclone-handle-delete-file):
* lisp/net/tramp-sh.el (tramp-sh-handle-make-symbolic-link)
(tramp-sh-handle-set-file-modes, tramp-sh-handle-set-file-times)
(tramp-sh-handle-add-name-to-file)
(tramp-sh-handle-copy-directory, tramp-do-copy-or-rename-file)
(tramp-sh-handle-delete-directory, tramp-sh-handle-delete-file)
(tramp-sh-handle-write-region):
* lisp/net/tramp-smb.el (tramp-smb-handle-add-name-to-file)
(tramp-smb-handle-copy-directory, tramp-smb-handle-copy-file)
(tramp-smb-handle-delete-directory)
(tramp-smb-handle-delete-file)
(tramp-smb-handle-make-directory-internal)
(tramp-smb-handle-make-symbolic-link)
(tramp-smb-handle-rename-file, tramp-smb-handle-write-region):
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-handle-add-name-to-file)
(tramp-sudoedit-do-copy-or-rename-file)
(tramp-sudoedit-handle-delete-directory)
(tramp-sudoedit-handle-delete-file)
(tramp-sudoedit-handle-set-file-modes)
(tramp-sudoedit-handle-set-file-times)
(tramp-sudoedit-handle-make-symbolic-link): Do not flush all file
properties of upper directory.

* lisp/net/tramp-cache.el (tramp-flush-file-upper-properties):
New defun.
(tramp-flush-file-properties, tramp-flush-directory-properties):
Use it.

* test/lisp/net/tramp-tests.el (tramp-time-diff): Declare.
(tramp--test-file-attributes-equal-p): Handle also modification
and status change time.