Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "NSB: fix vpe_config license"
  - NSB: fix vpe_config license

    Use Apache 2.0

    Change-Id: I199d09f04a5c84a25bd91dceba5e4ed1f93075f6
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 0ed5c9e..dc3b49b 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 0ed5c9e36d401fd89614c321470b28e91c6a5755
+Subproject commit dc3b49b7e91528f87130cda3160381048570e286