Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Set SwiftOperator as operator role if Apex"
  - Set SwiftOperator as operator role if Apex

    It avoids any possible side effect for Apex after the previous
    sync with OpenStack [1].

    [1] https://gerrit.opnfv.org/gerrit/67164

    Change-Id: If65ca669b899b5ab5418c3db3272a5cfd3894df2
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index e1698c2..34180ff 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit e1698c2c7f45e42c18b9ef75bcc0f5b896bd5de6
+Subproject commit 34180ff2b4325960a6565f9d10ff04e6f85c0415