Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "lib.sh: Remove all storage on undefine"
  - lib.sh: Remove all storage on undefine

    While executing the deploy script via sudo will raise no issues with
    re-using old storage volume files, non-root deploys fail to change
    ownership of said files.

    Properly clean after ourselves when destroying and undefining VMs.

    JIRA: ARMBAND-311

    Change-Id: I7fdd269dccbfd5ab5285d852ac7dacfc4dc5ccd7
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>