Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Switch testcase to test case in docstrings

    Change-Id: Iea64673788a3d5ab5eb3028522f659de183440ed
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 9648154..b1b15c9 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 96481540320550457181696c43a0e2fa34b9273d
+Subproject commit b1b15c970e0be65b04a94ed9ac2afcbc63a7f901