Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 2c2babc8b92352fe13b54ba473a920da60f0d9f1
  - use lf-virtual1 instead of lf-build2 which is failing

    Change-Id: I9f6b6823886a1b0dd473757bb2c0f957d4beff53
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 236ef4d..2c2babc 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 236ef4dffcd337a77e9ac8f400e13dc7e480d4f5
+Subproject commit 2c2babc8b92352fe13b54ba473a920da60f0d9f1