Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'stable/fraser'
  - Skip searching network in project if external or shared

    It meets the OpenStack rules:
      - any router can be connected to an external network.
      - any VM can be connected to a shared network

    It completes https://gerrit.opnfv.org/gerrit/59865 which partially
    skip the lookup.

    Then CreateRouterSuccessTests passes when the external network is not
    owned by the user running snaps_smoke.

    JIRA: SNAPS-320

    Change-Id: I2c60363002c6b667f90ff3f5f984eace4fa86c99
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 821d86248054017ea8ac40b99759df71fa639e3b)