Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - bug-fix: veriry job no coverage package

    JIRA: BOTTLENECK-219

    vitualenv should install nose and coverage package for unittest,
    only install coverage is not enough since virtualenv will use
    external nose which couldnt find coverage package installed
    externally

    Change-Id: I6daebf2db6dd97cdfd0eac0c43a619229ba38577
    Signed-off-by: Yang Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index eca62b8..56b1baf 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit eca62b89506ffa7b3b4f70cda3b10160c38158a5
+Subproject commit 56b1baf063b06ad96bcb9267a5439646f77d2776