Add the new graceful_halt settings to `config.vm`

config/default.rb

@@ -13,6 +13,8 @@ Vagrant.configure("2") do |config|
   config.vm.usable_port_range = (2200..2250)
   config.vm.box_url = nil
   config.vm.base_mac = nil
+  config.vm.graceful_halt_retry_count = 60
+  config.vm.graceful_halt_retry_interval = 1
   config.vm.guest = :linux
 
   # Share SSH locally by default

plugins/kernel_v2/config/vm.rb

@@ -15,6 +15,8 @@ module VagrantPlugins
       attr_accessor :base_mac
       attr_accessor :box
       attr_accessor :box_url
+      attr_accessor :graceful_halt_retry_count
+      attr_accessor :graceful_halt_retry_interval
       attr_accessor :guest
       attr_accessor :host_name
       attr_accessor :usable_port_range
@@ -26,6 +28,8 @@ module VagrantPlugins
 
       def initialize
         @forwarded_ports              = []
+        @graceful_halt_retry_count    = UNSET_VALUE
+        @graceful_halt_retry_interval = UNSET_VALUE
         @shared_folders               = {}
         @networks                     = []
         @provisioners                 = []