Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Simplify external networking for os"
  - Simplify external networking for os

    We were right now creating an overlay network with gateway in the opnfv
    vm. This makes floating ips work but if we need internet connection from
    vms, things get complicated and messy.

    As we are only using up to 7 ips from the 192.168.122.0/24, we can
    consider it the provider network for openstack and use ips starting from
    192.168.122.100 as floating ips or ips for routing (doing SNAT as
    always)

    Change-Id: I09af663069ae95a9d265d98f1531778eb37134e2
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 3c4f0f6..4597bb3 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 3c4f0f674393efc212434f8a3cb2820badeb0390
+Subproject commit 4597bb3c4ff273a68d73883a9d87520517d60876