Updated git submodules

Project: releng/builder master b77ff82ba886206add03c0144ce9705ecd7e2557

Merge "Update Ubuntu 16.04 images"

Update Ubuntu 16.04 images

- Pull in the latest Java security updates and systems updates
- Pull in the Quagga/6Wind binaries
- Image set as public.
  "id": "7eaec9c7-4be2-4a36-8566-35bbe33abcc8",
  "visibility": "public",
  "name": "Ubuntu 16.04 - mininet-ovs-25 - 20170808-0158"

Change-Id: I35dfe1cf93aeae18d0647abf66779d66ee3c5e5f
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>

diff --git a/docs/submodules/releng/builder b/docs/submodules/releng/builder
index 8d2f7df3cdb581f4d69c6617177d40537ab9fb0b..b77ff82ba886206add03c0144ce9705ecd7e2557 160000 (submodule)
--- a/docs/submodules/releng/builder
+++ b/docs/submodules/releng/builder
@@ -1 +1 @@
-Subproject commit 8d2f7df3cdb581f4d69c6617177d40537ab9fb0b
+Subproject commit b77ff82ba886206add03c0144ce9705ecd7e2557