Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Set the installer and move scenario extraction into functions

    The scenarios named os-* are deployed by osa and the ones
    named k8-* are deployed by kubespray. This change determines
    the installer to use by looking into the scenario name.

    The installers are currently hardcoded within xci-set-scenario.sh
    script and this needs to be fixed for other installers when they
    onboard to xci.

    Apart from setting the installer, extraction of generic and external
    scenarios are moved into corresponding functions.

    Change-Id: I19882bcd2a1260765e601ecbe517551c60401d74
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>