Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Enable doctor-notification"
  - Enable doctor-notification

    The testcase has been expected to work since the nova bug [1] was
    bypassed [2].

    [1] https://bugs.launchpad.net/nova/+bug/1742827
    [2] https://gerrit.opnfv.org/gerrit/#/c/52075/

    Change-Id: If53da6313381cf69a0093a6677db3d9033fb8f48
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index ccfdb36..cf456f4 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit ccfdb361d9b33a5ea84526344a1695571b901892
+Subproject commit cf456f4397e0920da49289b3d90f0a9da62d025a