Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 59ee11be51545ac5902c8c6789c1a3a44425ef73
  - Merge changes from topic "OOM-1853"

    * changes:
      Run env setup only once
      Fix condition for checking if tests are defined

  - Run env setup only once

    prep_ubuntu_16_04_for_molecule routine was taken out of
    run_molecule function so that it's not superfluously run
    on each molecule invocation

    Change-Id: I1e4d3f32fbec4fa1e96389d9d65740747bffcef6
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
    Issue-ID: OOM-1853

  - Fix condition for checking if tests are defined

    Native shell conditional is used as previously the condition
    would give warnings on stderr in certain cases, e.g. when
    role was removed script reported:
    "find: ‘ansible/roles/<rolename>’: No such file or directory"

    Change-Id: I63f50bda94e144a17307d927a6be70ae270f28bf
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
    Issue-ID: OOM-1853