Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Update artifacts url"
  - Update artifacts url

    Use artifacts.opnfv.org intead of other urls

    Change-Id: I9a04d89cfbb8ee3c1296cff4a60180ae3248f1f2
    Signed-off-by: Julien <zhang.jun3g@zte.com.cn>

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index 5fe7c28..4637bbf 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit 5fe7c289c0588ace681979138a20dc893ee64831
+Subproject commit 4637bbfef69cfd1a5c7bd1f0466cde64050c0d61