Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 1d79ca66519614891843e993c5ea1b7502fc261c
  - Move lint to opnfv-build

    lf-build6 is offline.

    Change-Id: Ib40cf3b99edf4ed74034c66c3a2790e7ad91fcaa
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index afb1aa9..1d79ca6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit afb1aa9ba453b4ab3873d1eb1fc533dc53f6ab18
+Subproject commit 1d79ca66519614891843e993c5ea1b7502fc261c