Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Export env vars via os.environ in test_openstack_utils.py"
  - Export env vars via os.environ in test_openstack_utils.py

    CONST shouldn't be used for getting/setting env vars.
    It adds complexity and may raise side effects.

    Change-Id: I8319748dd2f0abb95b82a2f65191cac8ccba7f5e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 6770605..b1522c3 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 67706058e7627cd3109e141caf6901be34922910
+Subproject commit b1522c34d95f9bb48fc9cfca91f281da2f958953