Remove the 'fake' and 'ssh' drivers, since they should not show up in
production, and it is better to have production-oriented sane defaults.
Updates the option doc string with a lengthy description.
Updates the developer documentation with a link to the wiki page,
where a list of CI-tested drivers will be maintained.
Change-Id: I1151ace22752efdf6a8a43e279a57d728ea6cce2
bc17510675