Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Rename testcase_base to testcase"
  - Rename testcase_base to testcase

    It simply removes the useless suffix.

    Change-Id: Ib9a682b57d8f33518359d817a593bb3786577390
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 514c97b..18ffb2a 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 514c97b036cf968e03e600a4761757448bef0a0a
+Subproject commit 18ffb2a431fd82055cd5abf656f00f2c90af7146