Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Stop setting 8.8.8.8 as default DNS server

    That could easily raise side effect as it overrides default configs
    set by Cloud providers.

    Change-Id: I659d16f8f58bba3a07b8ae2ee2270aa69c200ed5
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 7c0423f..4aaf778 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 7c0423fc13326bb44f33fce8d7a8e698961eaa9c
+Subproject commit 4aaf7780ad11690f2593078876f7b22726a14178