Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - Merge "system bandwidth testcase frame rebuild"
  - system bandwidth testcase frame rebuild

    JIRA: BOTTLENECK-177

    This patch will debug some error in system bandwidth testcase.
    use the new docker way to test this testcase.
    Bug fix about dashboard and test framework.

    Change-Id: I7167ffd75efab9a7780407aa5b9a4337ebb9b4c7
    Signed-off-by: liyin <liyin11@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 6fc8b39..2550aa2 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 6fc8b3930b871cf78e56df98ef15df320efde4af
+Subproject commit 2550aa20b7216741e605405ea919f18b18097b35