Update git submodules

* Update docs/submodules/pharos from branch 'stable/euphrates'
  - Merge "Updated fuel adapter (ODL)" into stable/euphrates
  - Updated fuel adapter (ODL)

    Change-Id: I4ff233460bb4fbd88277f2798f5f6380ff3b367d
    Signed-off-by: Guillermo Herrero <guillermo.herrero@enea.com>
    (cherry picked from commit eeb38b5a9e900d2e0e1e52276f6b2e533eee4b1c)

diff --git a/docs/submodules/pharos b/docs/submodules/pharos
index 7d5c9ad..ff8457d 160000 (submodule)
--- a/docs/submodules/pharos
+++ b/docs/submodules/pharos
@@ -1 +1 @@
-Subproject commit 7d5c9adb99dafcb4d205e360e6175b0aae23dd69
+Subproject commit ff8457dedbdad4207557d9b9d91000a1b2990d34