* `vagrant ssh` has a --no-tty flag colliding with the one defined in
`bin/vagrant` - in fact none of the flags in `bin/vagrant` are
processed in `serve` mode, so remove the code that captures them from
the CommandInfo OptionParser dance
* `vagrant ssh` has a `--plain` flag colliding with the one defined in
`internal/cli/base.go` - this flag was inherited from Waypoint, so we
can just rename it to line up with the (inversely defined) `--color`
flag used in legacy vagrant
7f56168959