Merge in more makefile edits from repo:voltha-docs

Change-Id: Iba7f6e565b45c5e888a34bce295d8fada8ab2ce2
diff --git a/.gitreview b/.gitreview
old mode 100755
new mode 100644
index b07c4a6..53c1e62
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=onf-make.git
 defaultremote=origin
+defaultbranch=master