Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to a2e2b84c0437aa09724319b49e968776dad71b5b
  - Merge "Adding Ubuntu support in Ansible - helm role"
  - Adding Ubuntu support in Ansible - helm role

    Extending ansible playbooks of ubuntu support.
    Creating new test with Ubuntu image for Molecule in helm role.

    Issue-ID: OOM-1671
    Signed-off-by: Jan Benedikt <j.benedikt@partner.samsung.com>
    Change-Id: If28ee7674c4f9eebc4420f4dbbb1385a408d3802