Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - Merge "Fix controller IP parsing in "nsb_setup.sh" script" into stable/euphrates
  - Fix controller IP parsing in "nsb_setup.sh" script

    Fixed the controller IP parsing in "nsb_setup.sh" script. The new
    regex expression now accepts "OS_AUTH_URL" as:
      * http://10.237.223.168/identity
      * http://10.237.223.168:5000/identity
      * http://hostname/identity
      * http://hostname:5000/identity

    JIRA: YARDSTICK-829

    Change-Id: Ifaeab991bcbb6aa7b22c3533ab7554527184878b
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>
    (cherry picked from commit b5e35986a77831841b064e435a6041a121634bec)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 9e218eb..e9973c8 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 9e218eb334621677379485033b3a75ea6cae2ac3
+Subproject commit e9973c86a548ea2b62cd85b25e52e5a3063c9415