Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - Merge "Change PTL informatin in INFO"
  - Change PTL informatin in INFO

    Due to recent email voting results, change the PTL promotion
    result in INFO. Detailed information could be found below.
    https://lists.opnfv.org/pipermail/opnfv-tsc/2017-April/003422.html

    Change-Id: I5c942668cbe03e697bd0865cc8aee1980afed104
    Signed-off-by: yuyang <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 15355fd..2d9642a 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 15355fd57080a7ac625549e9e9b98237164e46d2
+Subproject commit 2d9642a33a6a58f53aceba4ff3d6242f191f25f0