Update git submodules

Update git submodules

* Update neutron-lib from branch 'master'
  to d31f1b3678251a1d0845713178e2bbdb9eef45e8
  - Merge "Deprecate "is_advsvc" attribute in the Context object"
  - Deprecate "is_advsvc" attribute in the Context object

    Since some time we have already "context.Context.is_service_role"
    attribute in the context.Context object and this one should be used
    instead of old "is_advsvc" with S-RBAC.
    There was however missing __init__ method attribute to force configure
    Context as service_role context - this was possible until now only to do
    with is_advsvc parameter.

    This patch adds is_service_role parameter to the
    context.Context.__init__ method and deprecates old attribute
    "is_advsvc".

    Change-Id: I1d2377fb452896544573b1aabb70df0623d9e097
    Signed-off-by: Slawek Kaplonski <skaplons@redhat.com>