Add placeholder remote guest name

lib/vagrant/guest/remote.rb

@@ -60,8 +60,15 @@ module Vagrant
       #
       # @return [Symbol]
       def name
-        # TODO: this can probably be deleted
-        client.parents[0]
+        # TODO: Get name from plugin
+        "placeholder"
+      end
+
+      # Returns the parent of the guest.
+      #
+      # @return [String]
+      def parent
+        client.parent
       end
 
       def to_proto

plugins/commands/serve/client/communicator.rb

@@ -178,7 +178,9 @@ module VagrantPlugins
         protected
 
         def generate_execution_request(machine, cmd, opts={})
+          opts = {} if opts.nil?
           opts_proto = mapper.map(opts, to: SDK::Args::Hash)
+          opts_any = Google::Protobuf::Any.pack(opts_proto)
 
           SDK::FuncSpec::Args.new(
             args: [
@@ -193,7 +195,7 @@ module VagrantPlugins
               ),
               SDK::FuncSpec::Value.new(
                 type: "hashicorp.vagrant.sdk.Args.Hash",
-                value: Google::Protobuf::Any.pack(opts_proto),
+                value: opts_any,
               ),
             ]
           )

plugins/commands/serve/client/guest.rb

@@ -11,14 +11,12 @@ module VagrantPlugins
         include Util::HasSeeds::Client
 
         # @return [<String>] parents
-        def parents
-          logger.debug("getting parents")
+        def parent
           req = SDK::FuncSpec::Args.new(
             args: []
           )
-          res = client.parents(req)
-          logger.debug("got parents #{res}")
-          res.parents
+          res = client.parent(req)
+          res.parent
         end
       end
     end