Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Wait for refstack-client to finish"
  - Wait for refstack-client to finish

    The previous implementation waited for /bin/sh to finish instead of
    refstack-client. Then tempest still ran in background even if the
    tescase was considered as finished.

    Now all tempest logs are only printed in the dedicated file.

    Change-Id: I94cd7c6fe68f3bc21782d8d9c43feee338c103ae
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index fe7ff12..d39bd66 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit fe7ff1238e2d086df8538d2c95eafc0a7cb4838d
+Subproject commit d39bd66631548b4e13ecff738bff682b455c6d2e