Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci sfc: Enable post merge deployment

    This change enables the deployment upon merge of a change.
    Followup patches will incorporate functest smoke and promotion
    which the promotion will most likely be the first one as functest
    parts are a bit tricky due to failures while running testing
    in VMs.

    Apart from the enablement of the deployments, job concurrency is
    disabled as well since we should only test one change at a time
    and attempt promotion for any scenario in order to ensure we keep
    the promotion consistent.

    Change-Id: Ib4b5754b6b88f42eab83c656e03773c83068016f
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>
  - xci: Convert execute shell scripts to external scripts

    The scripts used by verify jobs to create VMs, start deployments,
    run functest, and do cleanup for CI can be reused by other jobs as
    well so they are moved out of the yaml file.

    Apart from that, if we decide to change the way we run CI (not
    using VMs for performance reasons), we don't have to make big changes
    to yaml either.

    Change-Id: I2df1f2d60f999bcd7d53a5cd879112a5b2b0ca05
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 640039a..deb23d9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 640039a7f889753777fe76940ff22be4f777d612
+Subproject commit deb23d940ad85684c15fbee077fd1bf4c5e372d6