Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - [virtual] Rise memory for ovs/dpdk scenario

    Let's add more hugepages/memory to the compute nodes since
    snaps_smoke required 2Gb flavor for tests.

    Change-Id: If52f30d53a6469abeca67aaf2bdee551542d1653
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit 496c818b28b6d668428b3e8996675a7edd688f73)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 5638ff1..58948f3 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 5638ff11b251a2901886c07fa58d31ea53cd217d
+Subproject commit 58948f3d22c09959708a5fa371972ef3b3916335