Update gitreview for oslo in drools-pdp

Issue-ID: POLICY-5166
Change-Id: If523edf9a6bf504d08a523b915545562feb37ed1
Signed-off-by: rameshiyer27 <ramesh.murugan.iyer@est.tech>
diff --git a/.gitreview b/.gitreview
index 468f2e0..57fc57c 100644
--- a/.gitreview
+++ b/.gitreview
@@ -2,4 +2,4 @@
 host=gerrit.onap.org
 port=29418
 project=policy/drools-pdp.git
-defaultbranch=master
+defaultbranch=oslo