Commits on Nov 15, 2016

1. engine: Don't clean packages in base suites …

   If we're configured to process a suite without its base, we will
   currently clean the base suite's packages every time 'clean' is run.
   That means that the subsequent 'process' runs will reprocess the same
   pacakges.
   
   Fix this by keeping the packages in base suites too.

   Iain Lane committed Nov 15, 2016
   66c1ff0