Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: configure-nfs: Install the NFS server package

    We need to explicitly install the nfs server package instead of bundling
    it to the dib image since not every node needs it.

    Change-Id: I73f59f4ed582359df80ea08712b433537c087aea
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 8695777..725e250 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 86957779957b9c0d6013c6f22fbc2bc288cb5a7c
+Subproject commit 725e250ad2d36697487df629002a7caa7114c6d3