Update git submodules

* Update docs/submodules/bottlenecks from branch 'stable/danube'
  - Bug fix of Bottlenecks can't use CLI

    JIRA: BOTTLENECK-171

    Bug fix of Bottlenecks can't use CLI to start test.
    Some docker-compose function delete to fit elk docker support.
    After this patch you could use bottlenecks testcase run
    posca_factor_ping to start this test.
    you also need to put the rc file to bottlenecks docker.

    Change-Id: I340e31185a499c81f9595a902df89d8f0ddf0cd3
    Signed-off-by: liyin <liyin11@huawei.com>
    (cherry picked from commit 75f99aaeadada56dfc974746cd83fec275133a3c)

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 1fd4046..d31e40f 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 1fd4046eacef68412f65ac888646c14999fa8236
+Subproject commit d31e40fdf62cecd272ec7811d9205ea6916594f9