Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "New Heat IMS testcase"
  - New Heat IMS testcase

    In order to validate OpenStack Master deployment
    we create this new testcase using OpenStack Heat
    as an Orchestrator for  Clearwater VNF

    JIRA: FUNCTEST-995

    Change-Id: I8b7b74a3753c2d4d4614e9a2798283bd3f99d5d2
    Signed-off-by: Valentin Boucher <valentin.boucher@kontron.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 8a00300..a38b55b 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 8a00300b730d7302aff5f23e51669f1c12ef369e
+Subproject commit a38b55bbba3c7b6a354fc29da6bc3518c57caf52