Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge changes from topic 'fuel-armband-verify-sync'

    * changes:
      fuel, armband: Move GS_URL to installer params
      fuel, armband: Move SSH_KEY outside /tmp
      fuel, armband: verify jobs: Enable virtual deploy

  - fuel, armband: Move GS_URL to installer params

    JIRA: FUEL-278

    Change-Id: I9f5496d02097c2a6ae1db73b8a5df20b75ce728d
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - fuel, armband: Move SSH_KEY outside /tmp

    JIRA: FUEL-280

    Change-Id: Ia96986e3f289739914de6b7e63abfb0172b8e6b5
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - fuel, armband: verify jobs: Enable virtual deploy

    Enable virtual deploy phase for verify multijob for both projects.
    Since fuel-defaults already define SSH_KEY param, drop it from
    individual jobs.

    Fuel:
    - drop merge jobs, which used to perform virtual deploys based on
      ISO created during verify job;
    - cleanup fuel-download-artifact (rm support for merge/verify);

    Armband:
    - while at it, remove "opnfv-build-enea-defaults", preparing for
      arm-build2's retirement.

    JIRA: FUEL-278
    JIRA: FUEL-287

    Change-Id: I354d72d88187e41070f44c723ccc651a0bb9b021
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>