Remove patching, unpin requirements for build

This is still experimental, in an attempt to remove patching from
the build.

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: Idcbfc079e15cf3901a30958989e11fc97981f740
diff --git a/.gitreview b/.gitreview
index a95e0fb..ad2e175 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=voltha-system-tests.git
 defaultremote=origin
-defaultbranch=master
+defaultbranch=remove-robot-patching