Finish implementation of set-file-times FLAG arg in Tramp

Finish implementation of set-file-times FLAG arg in Tramp

* lisp/net/tramp-adb.el (tramp-adb-handle-set-file-times):
Implement FLAG.
(tramp-adb-handle-copy-file): Adapt `set-file-times' call.

* lisp/net/tramp-compat.el (tramp-compat-set-file-times): New defalias.

* lisp/net/tramp-gvfs.el (tramp-gvfs-handle-set-file-modes)
(tramp-gvfs-handle-set-file-times, tramp-gvfs-set-file-uid-gid):
Simplify `tramp-gvfs-url-file-name' call.

* lisp/net/tramp-sh.el (tramp-sh-handle-set-file-times): Implement FLAG.
(tramp-do-copy-or-rename-file-via-buffer)
(tramp-do-copy-or-rename-file-out-of-band): Add optional argument
OK-IF-ALREADY-EXISTS.  Adapt callees.
(tramp-do-copy-or-rename-file-via-buffer)
(tramp-do-copy-or-rename-file-directly)
(tramp-do-copy-or-rename-file-out-of-band): Adapt `set-file-times' call.

* lisp/net/tramp-smb.el (tramp-smb-handle-copy-directory)
(tramp-smb-handle-copy-file): Adapt `set-file-times' call.

* lisp/net/tramp-sudoedit.el (tramp-sudoedit-do-copy-or-rename-file):
Adapt `set-file-times' call.
(tramp-sudoedit-handle-set-file-times): Implement FLAG.

* test/lisp/net/tramp-tests.el (tramp-test22-file-times): Extend test.