providers/virtualbox: set proper mac address on priv net [GH-3588]

CHANGELOG.md

@@ -62,6 +62,8 @@ BUG FIXES:
   - commands/rsync-auto: Run properly on Windows. [GH-3547]
   - providers/virtualbox: VirtalBox detection works properly again on
       Windows when the `VBOX_INSTALL_PATH` has multiple elements. [GH-3549]
+  - providers/virtualbox: Forcing MAC address on private network works
+      properly again. [GH-3588]
   - provisioners/salt: Always copy keys and configs on provision. [GH-3536]
   - provisioners/salt: Install args should always be present with bootstrap.
   - provisioners/salt: Overwrite keys properly on subsequent provisions [GH-3575]

plugins/providers/virtualbox/action/network.rb

@@ -114,6 +114,7 @@ module VagrantPlugins
               ))
             end
 
+            p adapters
             env[:machine].provider.driver.enable_adapters(adapters)
           end
 
@@ -343,7 +344,7 @@ module VagrantPlugins
           return {
             :adapter     => config[:adapter],
             :hostonly    => interface[:name],
-            :mac      => config[:mac],
+            :mac_address => config[:mac],
             :nic_type    => config[:nic_type],
             :type        => :hostonly
           }