Tune Tramp traces

Tune Tramp traces

* doc/misc/tramp.texi (Traces and Profiles): Describe call traces.

* lisp/net/tramp-compat.el: Add `tramp-suppress-trace' property for all
functions.

* lisp/net/tramp.el (tramp-verbose): Adapt docstring.
(tramp-file-name-method, tramp-file-name-user)
(tramp-file-name-domain, tramp-file-name-host)
(tramp-file-name-port, tramp-file-name-localname)
(tramp-file-name-hop, tramp-file-name-user-domain)
(tramp-file-name-host-port, tramp-file-name-port-or-default)
(tramp-tramp-file-p, tramp-find-method, tramp-find-user)
(tramp-find-host, tramp-dissect-file-name)
(tramp-dissect-hop-name, tramp-debug-buffer-name)
(tramp-debug-outline-level, tramp-get-debug-buffer)
(tramp-get-debug-file-name, tramp-read-passwd)
(tramp-clear-passwd): Add `tramp-suppress-trace' property.
(tramp-debug-message): Activate call traces.

* test/lisp/net/tramp-tests.el (tramp--test-instrument-test-case): Simplify.