Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: Record distribution and NFVI information for scenarios

    A scenario may only support certain NFVIs or distributions so we
    need a mapping with all these things so we know what can be tested
    and where.

    Change-Id: Ibf1b640b762085f58627e05e1d2ca13edfc4d716
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: Decouple VM distribution from host OS

    Introduce a new XCI_DISTRO variable to select the distribution to deploy
    on the VMs in order to make deployments more flexible and decouple the
    VM OS selection from the host one. The default value for this new
    variable is to match the host OS but users can always set it to one
    of the supported distributions. We can now simply execute the
    install-ansible.sh script instead of sourcing it in order to keep
    the environment as clean as possible.

    Change-Id: Ia74eb0422f983848cde0fb7b220ea1035dfa78bc
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: nfvi: OSA: Remove duplicate xci-deploy.sh script

    It was committed by accident in c74cfd33fc3c ("xci: OSA: Move all the
    OSA specific playbooks to the NFVI directory") so drop it.

    Change-Id: I5de91f0aad750a9cb723a46baa63e75beb3180de
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 105e4a4..76da09f 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 105e4a455a5ef2c9add0a60f059c0e6fe04eba0f
+Subproject commit 76da09f4dea888b247dde3852bd895bbf0e4aa20