From: Bill Shannon <bill.shannon_at_oracle.com>
Date: Wed, 12 May 2010 15:56:57 -0700

In v2 there was a whole mechanism for installing and configuring
addons. Obviously none of that is supported in v3. (Right?)

If we start a v2 domain with v3, and there's anything in the addons
directory, shouldn't we produce a warning?