Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - MaaS: Fix conflicting curtin network config

    JIRA: FUEL-301

    Change-Id: I9de98fb961fd1d480b45a774de61ad6a93e9addf
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 3803f9ff798b5c186e605cb8366b5153ab4e19fc)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 62e032a..e708686 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 62e032ab0276fde84df3384bd341aa53e87fc88a
+Subproject commit e708686d0d6727feca64609ed5ff8e2328c0b5f5