Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 55edf66b72501fb5700abf490d927dc3808b5aeb
  - Merge "Modify the way override works"
  - Modify the way override works

    Now the generated app_helm_override_file and the list of
    helm overrides is separate.
    The former is to contain things like user provided overrides,
    the latter is the list of absolute paths to preexisting helm value files.
    The playbook joins all that into a final list of override files that is then
    passed to helm.

    Change-Id: I8b8ded38b39aa9a75e55fc63fa0e11b986556cb8
    Issue-ID: OOM-1951
    Signed-off-by: Michal Zegan <m.zegan@samsung.com>