Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Save space in Alpine containers"
  - Save space in Alpine containers

    It decreases the size of Functest core and smoke containers by 20%.

    Change-Id: Id75117b1404e3cce004ef51c61040cdb7ade6976
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 2f911f3..f190b35 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 2f911f3f0500b3a1a0f5352282e88e2aea925a6d
+Subproject commit f190b3532263cfede083b775c1f94cab1fa027fd