Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - Add/modify the Grafana Dashboard

    Adding/modify metrics and structure of dashboard
    for Long Duration Test

    Change-Id: I4d1f169b7aa1e0f906e09fae13010ad3b8b49038
    Signed-off-by: Yang Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index cb67313..8d5e2ff 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit cb67313c1e14b6eca057bdfc7722bc11506b7a2a
+Subproject commit 8d5e2fff2f9800942cf7f2c8a15b648ba3c76a16