Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[ovs/dpdk] Return true on linux.network state"
  - [ovs/dpdk] Return true on linux.network state

    linux.network state is expected to be down until node reboot
    to activate required hugepages therefore return true in any case.

    Change-Id: I61deac12b9ac212c5f79cdcce30cda8e5d24413b
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 0224929..75c2a7a 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 0224929b3a87d0e0ec011311c46872e6142497cf
+Subproject commit 75c2a7ac915d649db579337ebf2ca96a0f051ab2