Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Enable Doctor testcase for F-release

    doctor conforms with OpenStack Pike requirements then it could be
    enabled in functest-features and functest-restapi (master) [1].

    [1] https://gerrit.opnfv.org/gerrit/#/c/47283/

    Change-Id: I82135a64cf0aac5ebf5b56260ede24b592fca41b
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index d47e64b..68104d1 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit d47e64bba6466affc3ff0999ae489ec7393ef630
+Subproject commit 68104d112a9aae799e2947e3252854521bfc85c8