Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 46c5d310b24563ba9de00d0583e76742efc2cc0d
  - Make aio.sh preserve host's ssh keys if possible

    aio.sh script creates rsa key that is also added to host's authorized_keys.
    Currently, existing id_rsa keys are removed in order to generate fresh key each time.

    This change makes setup script reuse existing key when possible.

    Issue-ID: MULTICLOUD-676

    Change-Id: I3b6b837f64dabd3cb6a14aa5ea65e67c6b8db6a8
    Signed-off-by: Konrad Bańka <k.banka@samsung.com>