Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 70a61daa082a249542cceaf33b796954625118a1
  - Blacklist few Rally tests when verifying Airship

    Airship doesn't support live migration and resize server.
    It blacklists them even if all other OPNFV installers have always
    supported these capabilities.

    They are still listed as mandatory in CNTT then they are kept in
    CNTT RI compliance.

    Here are the Rally tests blacklisted here:
      - 'NovaServers.boot_and_live_migrate_server'
      - 'NovaServers.boot_server_attach_created_volume_and_live_migrate'
      - 'NovaServers.boot_server_from_volume_and_live_migrate'
      - 'NovaServers.boot_and_migrate_server'
      - 'NovaServers.resize_server'

    Change-Id: I26f69fadf0e632f1e3b5dcd14baf7fccd694550b
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>