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>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 47fda31..70a61da 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 47fda3149de3d0abd9fca45e552cc67129e7d24c
+Subproject commit 70a61daa082a249542cceaf33b796954625118a1