Add base address attribute to vm config

plugins/kernel_v2/config/vm.rb

@@ -20,6 +20,7 @@ module VagrantPlugins
 
       attr_accessor :allowed_synced_folder_types
       attr_accessor :base_mac
+      attr_accessor :base_address
       attr_accessor :boot_timeout
       attr_accessor :box
       attr_accessor :ignore_box_vagrantfile
@@ -50,6 +51,7 @@ module VagrantPlugins
 
         @allowed_synced_folder_types   = UNSET_VALUE
         @base_mac                      = UNSET_VALUE
+        @base_address                  = UNSET_VALUE
         @boot_timeout                  = UNSET_VALUE
         @box                           = UNSET_VALUE
         @ignore_box_vagrantfile        = UNSET_VALUE
@@ -377,6 +379,7 @@ module VagrantPlugins
         # Defaults
         @allowed_synced_folder_types = nil if @allowed_synced_folder_types == UNSET_VALUE
         @base_mac = nil if @base_mac == UNSET_VALUE
+        @base_address = nil if @base_address == UNSET_VALUE
         @boot_timeout = 300 if @boot_timeout == UNSET_VALUE
         @box = nil if @box == UNSET_VALUE
         @ignore_box_vagrantfile = false if @ignore_box_vagrantfile == UNSET_VALUE

test/unit/plugins/kernel_v2/config/vm_test.rb

@@ -52,6 +52,13 @@ describe VagrantPlugins::Kernel_V2::VMConfig do
     end
   end
 
+  describe "#base_address" do
+    it "defaults properly" do
+      subject.finalize!
+      expect(subject.base_address).to be_nil
+    end
+  end
+
   describe "#box" do
     it "is required" do
       subject.box = nil