Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - Bug fix: Bottlenecks sometimes deadlock

    JIRA: BOTTLENECK-173

    This patch will change the way to call multithreading.
    And change some encoding error about Yardstick config

    Change-Id: I04803bff6acaad1089d180b104652049f1f0a485
    Signed-off-by: Ace Lee <liyin11@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 962b626..fe6c624 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 962b6269fdee0991251304a2b16cba78961d4b42
+Subproject commit fe6c624370552e141cc80d1b697de7d9717763c9