Move "cant_read_mac_addresses" error to the global space

Now it is used not only by Windows, but by Darwin guests as well.

lib/vagrant/errors.rb

@@ -248,6 +248,10 @@ module Vagrant
       error_key(:bundler_error)
     end
 
+    class CantReadMACAddresses < VagrantError
+      error_key(:cant_read_mac_addresses)
+    end
+
     class CapabilityHostExplicitNotDetected < VagrantError
       error_key(:capability_host_explicit_not_detected)
     end

plugins/guests/darwin/cap/configure_networks.rb

@@ -12,7 +12,7 @@ module VagrantPlugins
 
         def self.configure_networks(machine, networks)
           if !machine.provider.capability?(:nic_mac_addresses)
-            raise Errors::CantReadMACAddresses,
+            raise Vagrant::Errors::CantReadMACAddresses,
                   provider: machine.provider_name.to_s
           end
 

plugins/guests/windows/cap/configure_networks.rb

@@ -53,7 +53,7 @@ module VagrantPlugins
 
         def self.create_vm_interface_map(machine, guest_network)
           if !machine.provider.capability?(:nic_mac_addresses)
-            raise Errors::CantReadMACAddresses,
+            raise Vagrant::Errors::CantReadMACAddresses,
               provider: machine.provider_name.to_s
           end
 

plugins/guests/windows/errors.rb

@@ -6,10 +6,6 @@ module VagrantPlugins
         error_namespace("vagrant_windows.errors")
       end
 
-      class CantReadMACAddresses < WindowsError
-        error_key(:cant_read_mac_addresses)
-      end
-
       class NetworkWinRMRequired < WindowsError
         error_key(:network_winrm_required)
       end

templates/locales/en.yml

@@ -606,6 +606,14 @@ en:
         issues. The error from Bundler is:
 
         %{message}
+      cant_read_mac_addresses: |-
+        The provider you are using  ('%{provider}') doesn't support the
+        "nic_mac_addresses" provider capability which is required
+        for advanced networking to work with this guest OS. Please inform
+        the author of the provider to add this feature.
+
+        Until then, you must remove any networking configurations other
+        than forwarded ports from your Vagrantfile for Vagrant to continue.
       capability_host_explicit_not_detected: |-
         The explicit capability host specified of '%{value}' could not be
         found.

templates/locales/guest_windows.yml

@@ -1,14 +1,6 @@
 en:
   vagrant_windows:
     errors:
-      cant_read_mac_addresses: |-
-        The provider being used to start Windows ('%{provider}')
-        doesn't support the "nic_mac_addresses" capability which is required
-        for advanced networking to work with Windows guests. Please inform
-        the author of the provider to add this feature.
-
-        Until then, you must remove any networking configurations other
-        than forwarded ports from your Vagrantfile for Vagrant to continue.
       network_winrm_required: |-
         Configuring networks on Windows requires the communicator to be
         set to WinRM. To do this, add the following to your Vagrantfile: