Pass along provider to environment.target

Mirrors change in https://github.com/hashicorp/vagrant-plugin-sdk/pull/157

lib/vagrant/environment/remote.rb

@@ -108,9 +108,10 @@ module Vagrant
       # Gets a target (machine) by name
       #
       # @param [String] machine name
+      # @param [String] provider name
       # return [VagrantPlugins::CommandServe::Client::Machine]
-      def get_target(name)
-        client.target(name)
+      def get_target(name, provider)
+        client.target(name, provider)
       end
 
       # Returns the host object associated with this environment.

lib/vagrant/machine/remote.rb

@@ -30,7 +30,7 @@ module Vagrant
         @logger = Log4r::Logger.new("vagrant::machine")
         if !env.nil? && client.nil?
           @env = env
-          @client = env.get_target(name)
+          @client = env.get_target(name, provider_name)
         else
           @client = client
           @env = client.environment