Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Optimize Alpine Dockerfiles"
  - Optimize Alpine Dockerfiles

    It mainly splits vnfs runtime and build dependencies to save space at
    the end.

    Change-Id: I8307fa416066cc8c50b96862de8bafd2c47a2ace
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 42c9977..c34e1ef 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 42c99773c40f669b18c489a8f8b1c9bbb79d51d9
+Subproject commit c34e1ef3c7f5cb047fcbdb8f7f3d6ed2b832aa0c