Update git submodules

* Update docs/submodules/bottlenecks from branch 'master'
  - Merge "VNF characterizaion scale_out test, untested"
  - VNF characterizaion scale_out test, untested

    The purpose of this test is to increase the
    number of VNFs being tested while monitoring
    aggregate performance scaling.

    requires https://gerrit.opnfv.org/gerrit/#/c/37993

    Change-Id: I0015ef0326859512c7b9ab4c57ef9b5a710ca852
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index 699155d..96d315d 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit 699155d9b81ed0f7b3d43eef6dac932bc3de1208
+Subproject commit 96d315d2fe641c375ad659426f4e8a6c85eccc6d