Update git submodules

* Update docs/submodules/releng from branch 'master'
  to c7bffea1721ac805371d700c68fe14aeb7ce2f03
  - Remove jjb/ovn4nfv (Archived)

    The project is archived as per IT-20788.
    This patch would be safely reverted if any change.

    Change-Id: I9790b2f15aa1b3c62ca7c12f89723679b0a114f2
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d826e78..c7bffea 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d826e782106c84161fae89c3e185072422fa5ac7
+Subproject commit c7bffea1721ac805371d700c68fe14aeb7ce2f03