fix drools-apps csit failure

bash package has been removed
found a related bash script is the cause

Issue-ID: POLICY-2847
Change-Id: Id4940324d939adea9135ae6f00d53d38ec05589c
Signed-off-by: Taka Cho <takamune.cho@att.com>
diff --git a/scripts/policy/config/drools-apps/custom/features.pre.sh b/scripts/policy/config/drools-apps/custom/features.pre.sh
index e9c77a0..fd7b5b9 100755
--- a/scripts/policy/config/drools-apps/custom/features.pre.sh
+++ b/scripts/policy/config/drools-apps/custom/features.pre.sh
@@ -1,4 +1,4 @@
-#!/bin/bash -x
+#!/bin/sh
 # ============LICENSE_START===================================================
 # Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
 # ============================================================================
@@ -15,4 +15,4 @@
 # limitations under the License.
 # ============LICENSE_END=====================================================
 
-bash -c "features disable distributed-locking"
+sh -c "features disable distributed-locking"