Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Read thirdparty-requirements.txt if py3"
  - Read thirdparty-requirements.txt if py3

    It fixes the current build issues due to unsynced doctor [1].

    [1] https://build.opnfv.org/ci/job/functest-features-docker-build-arm64-master/455/console

    Change-Id: Iad8b667e2615dcd976cd8120e4204665134922b7
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 427547d..d0d4715 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 427547d5680878dabfa1e8d1e53fdb2921fd01ab
+Subproject commit d0d471502ff7b5dfabf4a2ede79782c5708a463c