Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "bifrost: Move DIB configuration variables to bifrost"
  - bifrost: Move DIB configuration variables to bifrost

    The DIB variables only make sense on bifrost so they should live in the
    bifrost provision script.

    Change-Id: I05baca7b9c6889a0d401a9288998991324d270af
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 941bfd7..a27157c 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 941bfd7be7cf37f33a2b4f821bbb869e25ebcfd2
+Subproject commit a27157c8f7a4af128de6b7a470fa5eddb158fa53