Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: Bump Kubespray SHAs and install ansible modules"
  - xci: Bump Kubespray SHAs and install ansible modules

    1. this change bumps Kubespray SHA to the HEAD of "master" as of 16.05.2018
    2. install ansible-modules-hashivault, due to kubespray refactor vault role
       https://github.com/kubernetes-incubator/kubespray/commit/07cc98197187535619ac8e57ee4e04ae02631a5

    installer-type:kubespray
    deploy-scenario:k8-nosdn-nofeature

    Change-Id: I2e3ade3b16eac1506e8556fe1820d84d64c09435
    Signed-off-by: wutianwei <wutianwei1@huawei.com>