MB-9123: Add checkpoint tests back to the Makefile

Since we will be making a bunch of changes to the checkpoint
manager in the near future adding thes back will help make it
easier to add new tests.

Change-Id: I64036319633e4c5a8ecab82d04f3962e121de68b
Reviewed-on: http://review.couchbase.org/29110
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>