Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Set the installer and move scenario extraction into functions

    The scenarios named os-* are deployed by osa and the ones
    named k8-* are deployed by kubespray. This change determines
    the installer to use by looking into the scenario name.

    The installers are currently hardcoded within xci-set-scenario.sh
    script and this needs to be fixed for other installers when they
    onboard to xci.

    Apart from setting the installer, extraction of generic and external
    scenarios are moved into corresponding functions.

    Change-Id: I19882bcd2a1260765e601ecbe517551c60401d74
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 10dea11..2bf0aeb 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 10dea113ea8329679157278dec41a58249322c66
+Subproject commit 2bf0aeb40a0c9801a49820874ae2de809d0045bc