Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge changes from topic 'common-ssh-manage-tasks'

    * changes:
      xci: osa: Use Ansible modules to create ssl certificates
      xci: osa: Move tasks for managing SSH keys to a new file

  - xci: osa: Use Ansible modules to create ssl certificates

    Ansible already provides modules to create ssl certificates so we can
    use these instead of running the openssl commands directly. Moreover, we
    can drop all the tasks which create the ssl directories since there are
    being created by the openssl package which also creates the appropriate
    symlinks. Finally, there is no need to generate the certificate on
    localhost if only the OPNFV host consumes it, so move these steps to
    the appropriate playbook.

    Change-Id: I0045945c502013be3d76440876e894a44a092690
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: osa: Move tasks for managing SSH keys to a new file

    The tasks that manage the SSH keys are common across hosts and
    also common across different installers. As such, lets move them
    to a new file so we can share them more easily.

    Change-Id: If235877394f224a47a2f2b8de748a2330eabcec1
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 4bc92b7..4e8278f 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 4bc92b7148d629c5082eaf7d49c98146b017ed04
+Subproject commit 4e8278f203675b8cf629ecceb625c21ff7efa3bc