Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 0aa470d1a0c7c32f60cadd0e781470073166c6a0
  - Merge "Install Curl which could be missing"
  - Install Curl which could be missing

    https://build.opnfv.org/ci/view/functest-kubernetes-trivy/job/functest-kubernetes-opnfv-functest-kubernetes-cnf-leguer-trivy/1/console

    Change-Id: Ibb91238202fb2802eeaa3a16ce6a233159bfa33c
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8666809..0aa470d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 86668093459c1de997b8f16ea27e9d9ba9ba1bef
+Subproject commit 0aa470d1a0c7c32f60cadd0e781470073166c6a0