Switch Tramp to cl-lib

Switch Tramp to cl-lib

* lisp/net/tramp-compat.el (cl-lib): Require it rather than cl.

* lisp/net/tramp-ftp.el: Don't require cl.

* lisp/net/tramp-gvfs.el: Don't require cl.
(tramp-gvfs-handler-mounted-unmounted)
(tramp-gvfs-connection-mounted-p): Use `cl-*' macros.

* lisp/net/tramp-sh.el: Don't require cl.
(tramp-set-file-uid-gid): Use `shell-quote-argument'.
(tramp-sh-gvfs-monitor-dir-process-filter)
(tramp-sh-inotifywait-process-filter): Use `cl-*' macros.

* lisp/net/tramp-smb.el: Don't require cl.
(tramp-smb-read-file-entry): Use `cl-*' macros.

* lisp/net/tramp.el (cl-lib): Require it rather than cl.
(tramp-parse-file, tramp-parse-shostkeys-sknownhosts)
(tramp-parse-passwd, tramp-parse-etc-group)
(tramp-parse-putty): Use `cl-*' macros.