Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[ha] AArch64: Add missing GPG key for armband repo"
  - [ha] AArch64: Add missing GPG key for armband repo

    In a regular baremetal HA scenario, all cluster nodes are provisioned
    via MaaS, which also adds the Enea GPG key to the APT keyring.
    However, for a hybrid deployment, virtual nodes are not provisioned
    by MaaS, so the GPG key should be added to reclass pillar data
    explicitly for Salt to be able to import it.

    JIRA: FUEL-338

    Change-Id: I333b7c373bdbc631c0f54ac549f97ab889dec77c
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>