Update git submodules

* Update docs/submodules/bottlenecks from branch 'stable/euphrates'
  - bugfix: copy hosts file

    JIRA: BOTTLENECK-227

    Operation of copying hosts file should follow the building of
    Yardstick docker

    Change-Id: I4d66efe8b823876a733d1877c26d1e0e263ca4da
    Signed-off-by: Yang Yu <Gabriel.yuyang@huawei.com>
    (cherry picked from commit 7b61cfd2e0c7bed6004f82d11b4cdc37a2e12cad)

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index e8796c3..0cd9851 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit e8796c31a6cd66da49082f0535dd4fbee9aaebb3
+Subproject commit 0cd98516d581bc661772473be92f7e4d5a26036d