core: build action builder if responds to call

lib/vagrant/action/runner.rb

@@ -19,8 +19,16 @@ module Vagrant
 
       def run(callable_id, options=nil)
         callable = callable_id
-        callable = Builder.build(callable_id) if callable_id.kind_of?(Class) || callable_id.is_a?(Method)
-        raise ArgumentError, "Argument to run must be a callable object or registered action." if !callable || !callable.respond_to?(:call)
+        if !callable.kind_of?(Builder)
+          if callable_id.kind_of?(Class) || callable_id.respond_to?(:call)
+            callable = Builder.build(callable_id)
+          end
+        end
+
+        if !callable || !callable.respond_to?(:call)
+          raise ArgumentError,
+            "Argument to run must be a callable object or registered action."
+        end
 
         # Create the initial environment with the options given
         environment = {}