Update git submodules

* Update docs/submodules/releng from branch 'master'
  to f1494a076f76a79cc60fe0fbfadd8e19dd67dfd4
  - Revert "Switch to lf-build2"

    https://build.opnfv.org/ci/view/xtesting-tox/job/xtesting-latest-tox/8/console

    This reverts commit 045d5b1454d84d94f321e7e59f4ac3f587119016.

    Change-Id: I71c3eda751df8c6c612dee8506669f192ce41a85
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0d83b25..f1494a0 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0d83b257a7bf721345e84a8fdf2ef14ad7c3ce74
+Subproject commit f1494a076f76a79cc60fe0fbfadd8e19dd67dfd4