Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "collectd: disable auto-provision"
  - collectd: disable auto-provision

    auto-provision requires Internet access inside
    the VNF, which may not be the case.

    Change-Id: I2b5b73e1b80074356943c5e3152c3e6a318f3ca4
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index bcbea95..a01f3f0 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit bcbea9565b14bae34706d7ca20257ec2b41985e1
+Subproject commit a01f3f0d97778d4ec768d70ab531a420ae5a66a6