Some accept-process-output cleanups in Tramp

Some accept-process-output cleanups in Tramp

* lisp/net/tramp.el (tramp-action-out-of-band): Read process
output in a loop.
(tramp-accept-process-output): Return result.
(tramp-interrupt-process):
* lisp/net/tramp-adb.el (tramp-adb-parse-device-names):
* lisp/net/tramp-rclone.el (tramp-rclone-parse-device-names):
Remove FIXME.

* lisp/net/tramp-sh.el (tramp-local-coding-commands): Fix docstring.

* lisp/net/tramp-smb.el (tramp-smb-wait-for-output): Adapt docstring.
Simplify code.

* lisp/net/tramp-sudoedit.el (tramp-sudoedit-action-sudo):
Adapt docstring.  Read process output in a loop.

* test/lisp/net/tramp-tests.el (tramp-test43-asynchronous-requests):
Remove :unstable tag on emba.