Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Update read and write data path in cinder test"
  - Update read and write data path in cinder test

    Update the path for read/write data
    Fix a false possitive result on read_data
    Fix read device name
    Unmount volume after writing data

    JIRA: FUNCTEST-908

    Change-Id: I555b5a3daaeff3aa58891e65c0b70094372c04c9
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 08ecefa..330cd75 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 08ecefa38aad23e42f3c2f2039cdcbaeccc2761c
+Subproject commit 330cd756ea8ba57755655143bce08f9200baf056