Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: scripts: build-dib-os.sh: chmod and chown files using sudo

    Some of the files may be owned by root so we need to ensure that
    everything is reset properly. Moreover, only clean the image files
    for the one we are building.

    Change-Id: I45b78db6715534187f19d9f513e8288fd076cb6b
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index a934224..dfd9229 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit a934224aed505efe524a9a4c2db3b917e5addfef
+Subproject commit dfd9229ad20d0ff724ce5ccf45161c8eb5e2c9e5