Rename tramp-use-ssh-controlmaster-options to tramp-use-connection-share

Rename tramp-use-ssh-controlmaster-options to tramp-use-connection-share

* doc/misc/tramp.texi (Ssh setup): Use tramp-use-connection-share.
Describe its settings for PuTTY.
(Remote processes): Use tramp-use-connection-share.

* etc/NEWS: Renamed user option tramp-use-connection-share.

* lisp/net/tramp-integration.el
(tramp-compile-disable-ssh-controlmaster-options):
Use `tramp-use-connection-share'.

* lisp/net/tramp-sh.el (tramp-use-connection-share):
Rename from `tramp-use-ssh-controlmaster-options'.  Make it a
defvaralias to `tramp-use-ssh-controlmaster-options'.
(tramp-ssh-controlmaster-options): Adapt docstring.
(tramp-methods) <plink, plinkx, pscp, psftp>: Adapt.
(tramp-ssh-controlmaster-options): Add plink implementation.