Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove opnfv module from functest-core"
  - Remove opnfv module from functest-core

    The releng/opnfv git repo is still kept in upper-constraints
    as it is required by sfc. And also delete the functions of
    check_env_variables, get_deployment_handler and create_directories.

    Change-Id: If498e68f0f94d6ebde1be55f5e3a17d06becaea4
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 83f2503..743f3f8 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 83f250371ce6782f069dfee068a19d9b90415666
+Subproject commit 743f3f835ecbbfdca21838dcd0a786975924cbf2