Make additional tests run under ctest

The 'non-io' tests should also be added to the suite. In this case they
are added with the 'select' plugin which is always built.

Change-Id: Ie519363369082b0b613285c23039966dd893e1ee
Reviewed-on: http://review.couchbase.org/38084
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>