Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Clover Gambia release 7.1.0"
  - Clover Gambia release 7.1.0

    Change-Id: I3ace7c17a86d87cc9c7e087e8663cd05860a9f51
    Signed-off-by: Stephen Wong <stephen.kf.wong@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 97ac0a2..47d79c9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 97ac0a2f740ebe29fbe1ec953b2c77b1aa43951d
+Subproject commit 47d79c9fa51530cc1c46be95bf5a6e70b7c74f1e