Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: Drop the python-crypto dependency

    The upstream pw-token-gen tool doesn't need python-crypto anymore since
    e9f957861b4160640f6debb2b939084ec43b43b2 ("Make pw-token-gen.py more
    random") so we no longer need to install that package.

    Change-Id: Ib53f246db999ff8ecfed2e3f62143c780c483fbd
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index cea2e33..6a86fba 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit cea2e3355bc6b5c059349c6c3ca2e96d214cbfb4
+Subproject commit 6a86fba9dac4c1f37d854335afb936d36967f084