Use `rx' in Tramp where possible

Use `rx' in Tramp where possible

* lisp/net/tramp.el:
* lisp/net/tramp-adb.el:
* lisp/net/tramp-archive.el:
* lisp/net/tramp-cache.el:
* lisp/net/tramp-cmds.el:
* lisp/net/tramp-compat.el:
* lisp/net/tramp-crypt.el:
* lisp/net/tramp-ftp.el:
* lisp/net/tramp-fuse.el:
* lisp/net/tramp-gvfs.el:
* lisp/net/tramp-integration.el:
* lisp/net/tramp-rclone.el:
* lisp/net/tramp-sh.el:
* lisp/net/tramp-smb.el:
* lisp/net/tramp-sudoedit.el: Use `rx' where possible.

* lisp/net/tramp-adb.el (tramp-adb-handle-set-file-times):
Use `eval-when-compile'.
(tramp-adb-maybe-open-connection): Use file-property for "/".  Use
`eval-when-compile'.

* lisp/net/tramp-cmds.el (mm-7bit-chars): Declare.
(tramp-reporter-dump-variable): Simplify point movement.

* lisp/net/tramp-gvfs.el (tramp-dbus-function): Fix typo.
(tramp-zeroconf-parse-device-names): Use `tramp-prefix-port-format'.

* lisp/net/tramp-sh.el (tramp-open-shell, tramp-find-shell):
Use `eval-when-compile'.  Improve sanity check.

* lisp/net/tramp.el (tramp-prefix-format, tramp-prefix-regexp)
(tramp-method-regexp, tramp-postfix-method-format)
(tramp-postfix-method-regexp, tramp-prefix-ipv6-format)
(tramp-prefix-ipv6-regexp, tramp-postfix-ipv6-format)
(tramp-postfix-ipv6-regexp, tramp-postfix-host-format)
(tramp-postfix-host-regexp, tramp-remote-file-name-spec-regexp)
(tramp-file-name-structure, tramp-file-name-regexp)
(tramp-completion-method-regexp)
(tramp-completion-file-name-regexp): Declare.
(tramp-set-syntax): Set also `tramp-completion-method-regexp'.
(tramp-volume-letter-regexp, tramp-completion-method-regexp-alist):
New defconsts.
(tramp-build-completion-method-regexp): New defun.
(tramp-completion-method-regexp): New defvar.
(tramp-completion-file-name-regexp-default)
(tramp-completion-file-name-regexp-simplified)
(tramp-completion-file-name-regexp-separate)
(tramp-completion-file-name-regexp-alist): Remove.
(tramp-build-completion-file-name-regexp): Rwrite.
(tramp-make-tramp-file-name): Use `tramp-archive-method'.
(tramp-handle-file-directory-p): Ignore errors.
(tramp-handle-find-backup-file-name, tramp-handle-lock-file)
(tramp-handle-make-auto-save-file-name): Use `eval-when-compile'.

* test/lisp/net/tramp-archive-tests.el:
* test/lisp/net/tramp-tests.el: Use `rx' where possible.
(tramp-test01-file-name-syntax): Adapt test.