Add -pR options to copy

Author: hico-horiuchi

lib/specinfra/command/base/file.rb

@@ -155,7 +155,7 @@ def create_as_directory(file)
     end
 
     def copy(src, dest)
-      "cp #{escape(src)} #{escape(dest)}"
+      "cp -pR #{escape(src)} #{escape(dest)}"
     end
 
     def move(src, dest)