Update git submodules

* Update docs/submodules/bottlenecks from branch 'stable/fraser'
  - add openstack-exporter uninstallation

    Since openstack-exporter has been added, the uninstallation
    should also be supported

    Change-Id: I9f2bfc44d04ace53a722b42897053c1a54cc6258
    Signed-off-by: Yang (Gabriel) Yu <Gabriel.yuyang@huawei.com>
    (cherry picked from commit 61467d8cb860cd3e3aebe64b5dc09813052ddc87)

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 6836d86..8be2469 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 6836d86ae4711d03942cccfee4674ad255a9cc50
+Subproject commit 8be2469831ba544877ac9bd0a8e31b3cc858d56f