Let users know we were not able to SSH into the VM to remove symlinks

lib/vagrant-cachier/action/clean.rb

@@ -10,6 +10,7 @@ module VagrantPlugins
         end
 
         def call(env)
+          @env     = env
           @machine = env[:machine]
 
           if should_remove_symlinks?
@@ -43,7 +44,7 @@ module VagrantPlugins
               end
             end
           rescue Timeout::Error
-            # We timed out, we failed.
+            @env[:ui].warn(I18n.t('vagrant_cachier.unable_to_ssh'))
           end
 
           return false

locales/en.yml

@@ -11,6 +11,8 @@ en:
       '%{current_path}' and it will be moved to
       '%{new_path}' as it is the new path for keeping machine
       scoped cache dirs starting with the 0.3.0 version of the plugin.
+    unable_to_ssh: |-
+      vagrant-cachier was unable to SSH into the VM to remove symlinks!
   vagrant:
     errors:
       multiple_provider_specific_cache_dirs_found: |-