* Add desktop_clipboard role option
As described in RFD 49, desktop_clipboard defaults to true.
Since sharing clipboards with a remote machine requires a high level
of trust, the presence of a single role in a role set which disables
the clipboard will result in the feature being disabled.
(This is in contrast to session recording, for example, where all
roles in a set must disable recording to turn it off.)
* completing TestBoolOptions
Co-authored-by: Isaiah Becker-Mayer <isaiah@goteleport.com>
