Add more parameters for the use case with slapos.package.

slapos/rebootstrap/__init__.py

@@ -97,6 +97,9 @@ Buildout will be restarted automatically to have this change applied.
         'buildout:parts=%s' % self.python_section,
         # do not load this extension
         'buildout:extensions=%s' % ' '.join(extension_list),
+        # more parameters for building slapos package
+        'buildout:rootdir=%s' % self.rebootstrap_directory,
+        'buildout:destdir=',
       ])
       self.logger.info('Rerunning buildout to install section %s with '
         'arguments %r.'% (self.python_section, args))