Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove floating ip of second instance in cinder testcase"
  - Remove floating ip of second instance in cinder testcase

    Change-Id: I30e30f1d35bb83984b63d7308331fc7bfee53955
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 780ca99..d97c579 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 780ca99c712cf6c94147bfc72095fba61768e74b
+Subproject commit d97c57931002895f2af45e521fb8fc20a11e82ca