providers/*: use special NOT_CREATED_ID if not created

plugins/providers/docker/provider.rb

@@ -146,12 +146,14 @@ module VagrantPlugins
         state_id = driver.state(@machine.id) if @machine.id && !state_id
         state_id = :unknown if !state_id
 
-        # If the machine is not created, make sure to clear out machine ID
-        @machine.id = nil if state_id == :not_created
-
         short = state_id.to_s.gsub("_", " ")
         long  = I18n.t("docker_provider.status.#{state_id}")
 
+        # If we're not created, then specify the special ID flag
+        if state_id == :not_created
+          state_id = Vagrant::MachineState::NOT_CREATED_ID
+        end
+
         Vagrant::MachineState.new(state_id, short, long)
       end
 

plugins/providers/hyperv/provider.rb

@@ -67,6 +67,11 @@ module VagrantPlugins
         short = state_id.to_s
         long  = ""
 
+        # If we're not created, then specify the special ID flag
+        if state_id == :not_created
+          state_id = Vagrant::MachineState::NOT_CREATED_ID
+        end
+
         # Return the MachineState object
         Vagrant::MachineState.new(state_id, short, long)
       end

plugins/providers/virtualbox/provider.rb

@@ -79,15 +79,15 @@ module VagrantPlugins
         state_id = @driver.read_state if !state_id
         state_id = :unknown if !state_id
 
-        # If we're not created, then reset the ID to nil
-        if state_id == :not_created
-          @machine.id = nil
-        end
-
         # Translate into short/long descriptions
         short = state_id.to_s.gsub("_", " ")
         long  = I18n.t("vagrant.commands.status.#{state_id}")
 
+        # If we're not created, then specify the special ID flag
+        if state_id == :not_created
+          state_id = Vagrant::MachineState::NOT_CREATED_ID
+        end
+
         # Return the state
         Vagrant::MachineState.new(state_id, short, long)
       end