Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: files: xci-destroy-env.sh: Remove VMs from all flavors"
  - xci: files: xci-destroy-env.sh: Remove VMs from all flavors

    If we switch from one flavor to another then some VMs may left behind
    so we need to cleanup the VMs from all flavors.

    Change-Id: I8b5d400b6d543b32b9cdaff73c3d173984357012
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 4fb43a0..5c19a78 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 4fb43a082642b02cba81440e1fcc03a01caa78ba
+Subproject commit 5c19a7833eafc7a9547e6b16d68794dbcd211d7a