Update git submodules

* Update docs/submodules/releng from branch 'master'
  - jjb: xci: xci-run-functest.sh: Reload XCI environment for functest

    We should reload the XCI environment before running functest in order to
    ensure that playbooks have the correct information from the XCI
    deployment.

    Change-Id: Ieadeca61d3ea3e504e21aa96945ad067f20d1489
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 79e542d..c87d100 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 79e542dffae23546da42ff35ad5219578259392b
+Subproject commit c87d1004da7339738f19ee909bad50e6f9bc9941