Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: files: Also collect BIFROST env variables for bug reports"
  - xci: files: Also collect BIFROST env variables for bug reports

    Bifrost is exposing quite a few variables so we need to collect them
    as well.

    Change-Id: I7e7ca7a093f35a0acb53af360e58444f6c1de7e4
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index dc1248f..6e35b28 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit dc1248fe7d989e9103cea7bfa8fd59814b86e0f1
+Subproject commit 6e35b2821d93d9ac58f354bff81a60581bc882e0