Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: Fix warning about missing inventory file"
  - xci: Fix warning about missing inventory file

    We no longer have a global inventory file and we don't need one right
    now since the bootstrapping opearations happen on the localhost anyway
    so we could be explicit and get rid of the following warning:

    [WARNING]: Host file not found: inventory
    [WARNING]: provided hosts list is empty, only localhost is available

    Change-Id: I5cfe7b0971397665cf9eae9c54985c44c4506449
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 5e2e518..cea2e33 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 5e2e51892e73bbb71714fb2713d7c1abeb80bfdc
+Subproject commit cea2e3355bc6b5c059349c6c3ca2e96d214cbfb4