Update git submodules

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

    Use Apache 2.0

    Change-Id: I199d09f04a5c84a25bd91dceba5e4ed1f93075f6
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    (cherry picked from commit 3e62c0669b73fd5a4b4d0d7e7a214853b343574a)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index f9eadce..33c4ec6 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit f9eadced5bdd726b4977738c634a26eef053dd2f
+Subproject commit 33c4ec6a7bb4abd30aeb3294950a57b70ac7bc6e