Updating voltha onos image to 4.1.4 in voltha 2.4

Change-Id: I2896b07e126072266d0d98eea7ba73dfb77097c6
(cherry picked from commit a2f2084a4e979440567a0bba4d675182e4a734fe)
diff --git a/.gitreview b/.gitreview
index 94a12ba..916ab10 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=voltha-docs.git
 defaultremote=origin
+defaultbranch=voltha-2.4