Change default branch in git review

Change-Id: Ia5e998030630c07c1db3fb294ccb8264d086a6d0
diff --git a/.gitreview b/.gitreview
index a080b19..76fa2b4 100644
--- a/.gitreview
+++ b/.gitreview
@@ -2,3 +2,4 @@
 host=gerrit.mcp.mirantis.net
 port=29418
 project=salt-models/mcp-virtual-aio
+defaultbranch=stable/newton