Add repository A as a subversion repository for a project. Build. Now add a
second repository, B. Hudson will say "Checking out a fresh workspace because
${env.workspace}/B doesn't exist", but will actually check out both A and B fresh.

This causes the next build to take a long time after adding (or changing) a
secondary repository and also seems superfluous; A should be updated as usual if
it still exists, and B should be checked out.