Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Linting should be done on a build server, not on master

    Linting was broken by this patch
    https://gerrit.opnfv.org/gerrit/#/c/50737/

    Also added sudo to pip installs, as they are not in a venv

    Patch forgot to put linting on build server
    so it defaulted to master.

    Change-Id: Iba8c1f633fad6d5f3d097f4911f45100c3b43e30
    Signed-off-by: agardner <agardner@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 85add83..92e57bf 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 85add8399995e3d29eb5c65f08dd1ffd46673008
+Subproject commit 92e57bfbd6e426c733e4687868b7637327c34958