Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - patches: pharos: IPMI: Trim netmask from IP

    ericsson-pod1 uses 'IP/netmask' format for IPMI IPs in its PDF, which
    is part of PDF spec, so update our installer adapter template
    accordingly.

    This change will be reverted once the patch is merged upstream in
    Pharos OPNFV git repo.

    Change-Id: Ie97177444f0445501fc0a7b131569ff1af6fee3c
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 94b3833e4b8c3de58cecd673091015a4c8f1640c)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index e71bd71..389271f 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit e71bd7124aea67df693d58dd8f534bf1ef8cb86c
+Subproject commit 389271f828486c77aec3cdd5a3405bb6d090d4b0