Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Assign heat_stack_owner role to the new user

    For heat scenario in rally, assign heat_stack_owner role to
    the new created users.

    Change-Id: I86a74ca88993ed3782d21b22eb5933d639d86c94
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 2bc2a04..2800b22 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 2bc2a045a42796610e2d1d38eada7972e8c96454
+Subproject commit 2800b22d762e938727ec4b466178eca4de05006d