Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Apex: Allow for  multi-version snapshots"
  - Apex: Allow for  multi-version snapshots

    This patch adds ability to manage multiple snapshot versions. We want to
    be able to have snapshots for noha and ha for multiple OS releases. This
    adds that capability and updates the deploy script to be able to deploy
    them. Also a user can specify which scenario to trigger with his ODL
    netvirt commit by doing 'opnfv-check <os version>-<ha|noha>

    Change-Id: I3884b41c86b55c187becfb83ef62f3431724d09e
    Signed-off-by: Tim Rozet <trozet@redhat.com>