Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "submodule: pharos: Bump to fix run without eyaml" into stable/euphrates
  - submodule: pharos: Bump to fix run without eyaml

    Most Fuel PODs do not use encrypted PDFs, so bump Pharos git
    submodule to include updated `generate_config.py` to silently
    skip decryption in case eyaml is not installed.

    Change-Id: I845a32c7001123a93e38197e0daf53d18c797aed
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 8c15c3675d57bfaed9c6923ed8adfdb6879fea49)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index d616588..fa7d8ec 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit d6165887af0b6c9d2024a17e7f4cc8039ca761ab
+Subproject commit fa7d8eca1d0a6d07284b9df4aa32dc873ec2f761