Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - Merge "Change OS exporter"
  - Change OS exporter

    1. The name of prometheus OS exporter is too long messing up
    the display of docker ps.
    2. Add version management of the exporter

    Change-Id: I3b634f2b3a274935ef27c0bcddeae3900170aebe
    Signed-off-by: Yang (Gabriel) Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index cb222b1..c4e5626 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit cb222b1b8c1c8272b9e88664e859bf86ea2e186e
+Subproject commit c4e5626d4ecf05a1b72b4bd0ab8f5c83245b0305