If packages are being published to verdaccio as well as upstream to
npmjs.org, then when the cache is updated from npmjs.org it uses the
dist-tags from the upstream even if the locally published version is
actually newer. This makes it very difficult to use verdaccio as a
staging registry for testing out potential releases.
This change partially reverts a change in behaviour that was introduced
in #8 which caused a regression for the staging style workflow that was
supported by sinopia.
