Improve autorevert-tests

Improve autorevert-tests

* doc/misc/trampver.texi:
* lisp/net/trampver.el: Change version to "2.8.1-pre".

* lisp/autorevert.el (auto-revert-mode, auto-revert-tail-mode)
(auto-revert-notify-handler, auto-revert--end-lockout):
Use `auto-revert-buffer'.
(auto-revert-notify-handler): Rearrange setting current buffer.
(auto-revert-handler): Add debug message.  Rearrange check.
Cancel lockout timer if running.

* lisp/net/tramp.el (tramp-barf-if-file-missing)
(with-parsed-tramp-file-name, tramp-skeleton-file-truename):
* lisp/net/tramp-archive.el (with-parsed-tramp-archive-file-name):
* lisp/net/tramp-message.el (tramp-with-demoted-errors):
Fix debug declatation.

* lisp/net/tramp-sh.el (tramp-sh-gio-monitor-process-filter): Do not
prepend remote prefix.

* test/lisp/autorevert-tests.el: Unify file notification libraries
"gio-monitor" and "gvfs-monitor-dir" to "gio".
(top): Set some Tramp related variables.
(auto-revert--timeout): Increase value.
(auto-revert--test-enabled-remote)
(auto-revert-test02-auto-revert-deleted-file): Do not check for
EMACS_HYDRA_CI environment variable.
(auto-revert--wait-for-revert): Fix regexp to search for.
(auto-revert--deftest-remote): Fix debug declatation.  Do not tag
:unstable.
(with-auto-revert-test): Fix debug declatation.  Adapt revert intervals.
(auto-revert-test*): Start with (file-notify-rm-all-watches).  Use
`buffer-string' and `string-match-p'.
(auto-revert-test00-auto-revert-mode): Unlock initial lockout.
(auto-revert-test01-auto-revert-several-files): Rearrange
temporary directory and file settings.
(auto-revert-test02-auto-revert-deleted-file): Adapt debug message.
(auto-revert-test03-auto-revert-tail-mode): Use `with-auto-revert-test'.
(auto-revert-test04-auto-revert-mode-dired):
Use `ert-with-temp-directory'.  Adapt prefix of tmpfile.
(auto-revert-test04-auto-revert-mode-dired)
(auto-revert-test05-global-notify, auto-revert-test06-write-file):
Wait for proper file modification.
(auto-revert-test--instrument-kill-buffer-hook): Fix debug message.
(auto-revert-test07-auto-revert-several-buffers): Use
`with-auto-revert-test.

* test/lisp/filenotify-tests.el: Unify file notification libraries
"gio-monitor" and "gvfs-monitor-dir" to "gio".
(file-notify--deftest-remote): Fix debug declatation.  Do not skip
for "gio".
(file-notify--test-with-actions): Fix debug declatation.

* test/lisp/net/tramp-tests.el (filenotify): Require.
(ert-remote-temporary-file-directory)
(tramp-test41-special-characters, tramp-test42-utf8)
(tramp-test45-asynchronous-requests): Do not check for
EMACS_HYDRA_CI environment variable.
(tramp-test46-file-notifications): New test.

(cherry picked from commit 4c9b37660771776563cf79bb3a2b6e692aa05ca2)