Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "prototypes: xci: Make sure Ansible dependencies are installed"
  - prototypes: xci: Make sure Ansible dependencies are installed

    'pip install ansible' is not enough on newly installed hosts which may
    lack the necessary build tools to install Ansible's dependencies. As
    such, we add a script similar to the bifrost/scripts/install-deps.sh
    one to pull in all the necessary distro-specific packages so Ansible
    and it's dependencies can be installed from scratch.

    Change-Id: I4b1e74644db9ace451ad763e4c54f1a3a43214fd

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 78bbd36..33ff972 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 78bbd3674a26bfab52ad1dd780889101aa7021dc
+Subproject commit 33ff97219e4915e4412eb4822918766ea2e2d1dc