Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Add cinder_test testcase"
  - Add cinder_test testcase

    Create 2 instances with Floating IPs
    Attach data volume to instance 1
    Write data on the volume
    Detach volume from instance 1
    Attach volume to instance 2
    Read data from volume

    JIRA: FUNCTEST-908

    Change-Id: I10efdfb3b7f9d7e6ab5c6a538052437585d52fb0
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 46d61da..9a78b4e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 46d61dac3e306249e729f45d25e33c3b4d7986e9
+Subproject commit 9a78b4eb52ff9847971c14f6f92b43cb48a73f3d