Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - Merge "Resolve full path to adminrc file if full path is not provided" into stable/euphrates
  - Resolve full path to adminrc file if full path is not provided

    Change-Id: I7e9d8074b5d956c864a0b3264926eee89e66dc35
    Signed-off-by: Charlie Kang <charlie.kang@intel.com>
    (cherry picked from commit baa6c60b3216a41978a136b9d32e054c52153935)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 63679e6..b581997 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 63679e6c68f6d3d881e222351785660dcac93f73
+Subproject commit b581997d49708b32096d62f863676fa9bfc2c834