Remove drools from engine CSITs compose

Remove drools from engine CSITs compose

Engine CSITs uses docker-compose-integration.yml which
is stored under policy/docker repo.   This is historical
as there are no robot tests on those CSITs that exercise
functionality with interactions between engine components
and drools.   drools and drools apps are covered on its
own CSITs.   This change will decouple drools-pdp image
from engine in CSIT tests.

Issue-ID: POLICY-2181
Signed-off-by: jhh <jorge.hernandez-herrero@att.com>
Change-Id: Ib528751dbd2cdce3e912012c9ce4429d8cbac030