Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Remove functest-components from gates"
  - Remove functest-components from gates

    It conforms with "Move rally_full in benchmarking" [1].

    [1] https://gerrit.opnfv.org/gerrit/#/c/66911/

    Change-Id: I6118630ec0957b12e5af1786ba93c8e7c114ca12
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3f4e84a..b1d420d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3f4e84a7401973f6449ff38f3ed4224a2572771a
+Subproject commit b1d420d23be0c0858548d825088a511ace371550