Update git submodules

* Update docs/submodules/bottlenecks from branch 'stable/euphrates'
  - bottlenecks offiline support

    JIRA: BOTTLENECK-224

    This patch for bottlenecks support offiline.
    By use some offiline image rather than yardstick env prepare.
    This will solve some problem happened in yardstick image builder.

    Change-Id: I62b6606570c2ea6ce365212c79777af01c47c9a6
    Signed-off-by: liyin <liyin11@huawei.com>
    (cherry picked from commit adf6a02bae295455f584ebab762592dd57e2422c)

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index ca20761..c7e43d9 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit ca207611e853332780f61b2a69b999a35e55d0c7
+Subproject commit c7e43d91f4a6babaff1f373b0a7ed102a876e7d3