Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - Add unit & coverage test

    JIRA: BOTTLENECK-219

    Using python-nose to run nosetests on unittest and coverage test

    Change-Id: I3928823bc2f8c65dbe770827ee69da8dd3ced1f2
    Signed-off-by: Yang Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 97a7762..cbd8645 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 97a77626cc17fb372a78ddfc78a66e483315b864
+Subproject commit cbd8645b9d529ce26535f0bb9553892c3fce4dc0