Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Vagrantfile: Add workaround for empty /etc/hosts

    Due to a bug in Yast2, /etc/hosts may be empty in Vagrant images so
    add a workaround for it.

    Change-Id: I1da9204a07f33008f9d5f1ec9ce976116e9d7a4c
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 036d1e4..ab3ebc4 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 036d1e4afb3692ce418c71cc445c0e28469cae5d
+Subproject commit ab3ebc4334b95f13948bac197bb145ef7b846890