Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "increase line length to 99"
  - increase line length to 99

    When line length is 79 I have to spend too much
    time manually wrapping my code into unreadable junk

    I can't use expressive tuple unpacking and I start
    shortening variables and other bad tricks to decrease
    the line length.

    We have too many levels of indent to manage with 79

    class:
      def:
         if:
             for:
                  etc.

    Change-Id: Ib2ce9cf887f9880c46815822c8d0e1a7806e53ca
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index b04755b..1ff9df7 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit b04755b5148daf36db436dc066e1bef2c93f1879
+Subproject commit 1ff9df7e724eb0c981aebd5f5b8aa90db0da292b