Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Disable the flavor aio and set default flavor to mini"
  - Disable the flavor aio and set default flavor to mini

    The flavor all-in-one (aio) hasn't been maintained well and
    the stability of it is in question. This change disables the
    flavor aio and sets the default flavor to mini.

    It is important for XCI to enable the aio back in order to help
    users who want to try XCI but don't have big enough machine to
    go for bigger flavors. However, we need to verify all flavors
    for acceptable user experience so the flavor can only be enabled
    back once this happens.

    Change-Id: I053c8fec78876dea71439f1f1bd737a105254ad4
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>