Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "container4nfv: add fraser branch in arm jobs"
  - container4nfv: add fraser branch in arm jobs

    Change-Id: If5b4dfaef431570f65a321209a4fa4c94292d89f
    Signed-off-by: Yibo Cai <yibo.cai@arm.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 5081dfa..7c0d98f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 5081dfa0afcf464c1a26cf2f68ebde76373165cb
+Subproject commit 7c0d98f1f5811ac15cdc043621530fa89f297615