Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 991cb8180af6183bcc30c5585dd0788fe3c9ee5f
  - Merge "JJB: Added Jenkins build job for CIRV."
  - JJB: Added Jenkins build job for CIRV.

    This patch adds verify job for CIRV.

    Co-Authored-By: Cédric Ollivier <cedric.ollivier@orange.com>
    Signed-off-by: Sridhar K. N. Rao <sridhar.rao@spirent.com>
    Change-Id: I4d24f76b122429ff10f6e80ec35e6c2fcb0da3e6

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 06bd9b5..991cb81 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 06bd9b521dd002c50de27d2ddcb55897a0f03597
+Subproject commit 991cb8180af6183bcc30c5585dd0788fe3c9ee5f