Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Pin kubespray to working sha"
  - Pin kubespray to working sha

    Kubespray works fine on supported distros so it is important we pin
    the sha and bump it in a controlled manner since people might be trying
    xci/k8 scenario and we want them to have working versions.

    Apart from that, scenario specific verify/merge jobs are being created
    at the moment and we need a working version to test the CI/testing side
    of things.

    Change-Id: I8702ed697057386449dc99d8cd14391de18f345a
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>