Add warning if machines provider does not support disk configuration

lib/vagrant/action/builtin/disk.rb

@@ -15,7 +15,8 @@ module Vagrant
           if machine.provider.capability?(:configure_disks)
            machine.provider.capability(:configure_disks, defined_disks)
           else
-            @logger.warn(":configure_disks capability not defined for provider, cannot configure disks")
+            env[:ui].warn(I18n.t("vagrant.actions.disk.provider_unsupported",
+                               provider: machine.provider_name))
           end
 
           # Continue On

templates/locales/en.yml

@@ -2153,6 +2153,9 @@ en:
       runner:
         waiting_cleanup: "Waiting for cleanup before exiting..."
         exit_immediately: "Exiting immediately, without cleanup!"
+      disk:
+        provider_unsupported: |-
+          Guest provider '%{provider}' does not support the disk feature, and will not use the disk configuration defined.
       vm:
         boot:
           booting: Booting VM...