Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[keepalived] Check proccess id of nginx on proxy"
  - [keepalived] Check proccess id of nginx on proxy

    By default vrrp script seeks out haproxy process id, so change
    check_pidof script arguments to "nginx" on proxy nodes.

    Change-Id: I616bf90ba49fa8257d28d236dcf3b7c5598039f1
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 2e58ae3..86e9d8d 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 2e58ae335ffd8a58499342df00683d53acb26928
+Subproject commit 86e9d8de2e3174438c5e640e0bd27d59d003126b