Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Update patch with ovs bridges as L3 ifaces

    Apply this patch if protocol is set to static to be
    intended for the ip address settings action only.

    Change-Id: I758340ff22376c01edd2a9a3555fe0fd9db3f4a9
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 21273a6..a12266c 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 21273a66c4a619a71e1e6bee7a6694cf8bb278d1
+Subproject commit a12266c64987be03998ee9ad663a691fd8b58134