Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: Move OpenStack-Ansible out of the main script"
  - xci: Move OpenStack-Ansible out of the main script

    In preparation for supporting more NFVIs in XCI, we need to make the
    main script NFVI agnostic. Right now, our NFVI is being deployed using
    bifrost+OSA so we keep bifrost in the main script since the hardware
    provisioning is NFVI agnostic (at least for now) but we move OSA to
    its own directory. This should allow more NFVI to plug into XCI by
    simply providing a nfvi-deploy.sh script. The user can select the
    preferred NFVI using the XCI_NFVI variable.

    Change-Id: Ieeacd3b22a64d363feff5d43ff23a80c39038837
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 6c728e2..73b03ea 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 6c728e29fee8e36b8ad66964e13ed2b311ef7bee
+Subproject commit 73b03eaf3a2241ee06708625c02f08f0ce30f494