This removes the need for the validation workaround for Docker, because
box_updated is once again available in that context.
We don't technically need the SyncedFolder priorities back on the Ruby
side, but wiring them through for symmetry.
Depends on https://github.com/hashicorp/vagrant-plugin-sdk/pull/183
The code running in the help subcommand relies on Command plugins being
returned from the manager with their options hash. Stubbing in a blank
hash prevents the command from crashing
What we really need is for CommandOptions to be modeled and passed
through from Go to Ruby so :primary subcommands can be displayed, but
that can be a follow-on task from this quick fix.
It looks like I might have been the first to hit provider cabability
invocation in testing these changes, and so I found these few missing
methods on the client. They're just copied over from the other
capability hosts.
Calling capabilities on a provider also revealed that the wrong Machine
type was being pulled out of the funcspec args, so we had to correct
that too in order to get the capability calls working.
This uses the new Push plugin support added to the plugin SDK in https://github.com/hashicorp/vagrant-plugin-sdk/pull/106 to make the following changes:
* The plugin manager on the Go side now registers push plugins
* The the _remote_ plugin manager on the Ruby side now calls over to
the go side to get push plugins
* All the wiring is hooked up such that when a push plugin is replaced
with its remote GRPC-client-wielding equivalent, the messages are
ferried around.
