Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - task: fixup s/exe_info/exc_info

    JIRA: YARDSTICK-785

    Change-Id: Ib37498e8df6a520f1d03256b73346fcedab3a177
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    (cherry picked from commit 9ea225f671b774c6e373dbaab146d68cac16194e)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index a8225b3..0006255 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit a8225b336df8fbb626a22bb38d8f8ca96af977f9
+Subproject commit 0006255b7488cea788416b00d76489a741e5db90