Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Update Alpine to 3.7"
  - Update Alpine to 3.7

    It conforms with the last release [1] and Docker latest [2].

    [1] https://alpinelinux.org/posts/Alpine-3.7.0-released.html
    [2] https://hub.docker.com/_/alpine/

    Change-Id: I731b455bd9eb9900c7794643b8605bf73a15726d
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index ba6bd3e..93833b7 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit ba6bd3ef221dc56a1ea2f74a1bc4d32d6fa21465
+Subproject commit 93833b79940a980b0afbad068cdc40d325a8e8b5