Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 2a4c4776daca85d66e478dd3f6a46a6e250934d0
  - Disable 'pipefile' shell opt in cloud-init's runcmd module

    Cloud-init runs runcmd module with default OS shell which
    evaluates to dash for Ubuntu and which in turn doesn't support
    'pipefile' option. This makes cloud-init fail the module on
    Ubuntu OS. In runcmd script there are no pipes so it's safe
    to remove it from shell opts.

    Change-Id: I0402fbfe13fe528832e64d107c1bc07bb5516fc2
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
    Issue-ID: OOM-1671