Update git submodules

* Update docs/submodules/ipv6 from branch 'master'
  - Update ODL Carbon status

    Updated ODL Carbon status by indicating deprecated old-netvirt

    Change-Id: I480788e6ef6ff3ba801651e4aa37ea4ab5929833
    Signed-off-by: Bin Hu <bh526r@att.com>

diff --git a/docs/submodules/ipv6 b/docs/submodules/ipv6
index be8ef89..e7045e0 160000 (submodule)
--- a/docs/submodules/ipv6
+++ b/docs/submodules/ipv6
@@ -1 +1 @@
-Subproject commit be8ef89c7d887117aa6f0d6ef3086509b0dbb3b3
+Subproject commit e7045e051d8500a2e3b4f2bebbf61e2511c5106a