Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 70f9f3024318d7e85c3dabe430175dcf03540a0e
  - Merge "Add tests for custom ntp authority mode in 'chrony' role"
  - Add tests for custom ntp authority mode in 'chrony' role

    By default 'infra' node is set up as a time authority
    for nodes. This patch adds tests for alternative supported
    scenario where external time authority service is given.

    Change-Id: I114418e79fa90b3af1c62a148ca91af3acf2bb2b
    Issue-ID: OOM-1810
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>