Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: run-functest: Add required functest packages

    The package requirements are the same across distros so
    we simply hardcode them in the task. Fixes the following problem:

    fatal: [opnfv]: FAILED! => {"changed": true, "cmd":
    "/root/run-functest.sh", "delta": "0:00:09.150226", "end": "2018-01-26
    14:01:18.758704", "failed": true, "rc": 125, "start": "2018-01-26 1
    4:01:09.608478", "stderr": "/root/run-functest.sh: line 14: wget:
    command not found

    Change-Id: Ib07acac18f8ece1111ee0706766f32005d0ac1da
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 9f585b8..19c6f8b 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 9f585b8d5eb8bffcb2040ef97ec8300c1af10d1f
+Subproject commit 19c6f8b9ceaddd8fc1cee1ad01db8320828b98fa