Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Skip modifying creds if Variables.robot is missing"
  - Skip modifying creds if Variables.robot is missing

    Variable.robot is missing in functest-features [1].
    As it's related to ODL csit suites, modifying it could be safely
    skipped as odl.py is designed for testing multiple ODL testcases.

    [1] https://gerrit.opnfv.org/gerrit/#/c/46225/

    Change-Id: Id5f1947a073d251ef7480f418218a4c85fe078c1
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e63b856..630f890 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e63b856182cb65f1943f83b672e7d9e8b9f3dc3e
+Subproject commit 630f89079aaaca4d14e6198046d20297f1893940