Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Remove volume type handling

    Rally scenarios don't require volume type to exist as a precondition.

    Change-Id: Id735346e062af084635fd8f76f3686005b9b8add
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 7a759b0..0b9923e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 7a759b0b687d66af60dc03955e33ea0f125193a4
+Subproject commit 0b9923e3e3a61062455600fbddffdc20df7ce9e6