turning with-id for tests on by default

with-id generates a numeric ID per test which can be
used later to re-run that specific test.

Change-Id: Ic190a915864d820126b464e059cbaa4f3a5329e4
Reviewed-on: http://review.couchbase.org/19886
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Benjamin Young <benjamin@couchbase.com>

setup.cfg

@@ -6,3 +6,4 @@ with-coverage=1
 cover-package=couchbase
 cover-html=1
 stop=1
+with-id=1