Update git submodules

* Update docs/submodules/releng from branch 'master'
  to c9321951ce4e0ec2f378ad0cb89c71199a0306b7
  - Add Octavia in Functest gates

    It's now avaible in functest-smoke:latest

    Change-Id: Ib6d5313d63c92a5e760714001a1b8ca670fa261f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 38212fb..c932195 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 38212fb43515a4681e2a0e90eea8abd44947892b
+Subproject commit c9321951ce4e0ec2f378ad0cb89c71199a0306b7