Update .gitreview for kohn

Issue-ID: CPS-1347
Signed-off-by: lukegleeson <luke.gleeson@est.tech>
Change-Id: Ib249e2ef79b8f316663c47f37fb939291e6a3923
diff --git a/.gitreview b/.gitreview
index 26b3266..d48dd55 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
         host=gerrit.onap.org
         port=29418
         project=cps/ncmp-dmi-plugin
-        defaultbranch=master
+        defaultbranch=kohn