* net/tramp.el (tramp-methods): Fix docstring.

* net/tramp.el (tramp-methods): Fix docstring.
(tramp-ssh-controlmaster-options): Rename it from
`tramp-ssh-controlmaster-template'.  Return a string.
(tramp-default-method): Adapt check for
`tramp-ssh-controlmaster-options'.

* net/tramp-sh.el (tramp-methods): Replace
`tramp-ssh-controlmaster-template' by "%c".
(tramp-do-copy-or-rename-file-out-of-band)
(tramp-maybe-open-connection): Use it in format spec.  Ensure,
that it is applied for the first hop only.