Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - patches: pharos: Drop patches merged upstream

    Also, remove redundant pharos patch that adds prx mgmt IPs:
    - "Re-assign mgmt network to proxy nodes"
    as those values are set already (to different values!) by patch:
    + "extend public gateway support"

    While at it, `make patches-export` should clean the patch dir first.

    Change-Id: Ice106e5d48c7b4cd90ffc6af7441199034d4f546
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit fbea9fae7a16f1375f7413ccd46146b015fc87ff)