Update git submodules

* Update docs/submodules/fuel from branch 'stable/danube'
  - Fix for reap.py giving negative id's for nodes

    Sort node id's as integer values instead of strings
    in order to return the actual minimum value
    by which the new list of nodes is generated

    JIRA: https://jira.opnfv.org/browse/FUEL-208

    Change-Id: If59d0d0ff9823076b337b042bceb4a736f1f9153
    Signed-off-by: Catalina Focsa <catalina.focsa@enea.com>
    (cherry picked from commit 9eb8c08a696be89a4e73d0e53b6aaf368634813a)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 26ddcc7..e14f155 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 26ddcc786462f926ab576f53694cba5a903f9bef
+Subproject commit e14f155b82b0fcd695606e785966d27af7b9e3de