Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "container4nfv: run scenarios on arm baremetal"
  - container4nfv: run scenarios on arm baremetal

    Change-Id: I3ee659fafcf37b84f261444844af9c421d6843ca
    Signed-off-by: Yibo Cai <yibo.cai@arm.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7b7a588..b0b7be2 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7b7a588c885f8abdae5ce35217cdbdebcd6bfcf4
+Subproject commit b0b7be23fa6c60b12c01ba575f2dcaec974d775d