Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - Merge "Replace nova get flavor with shade client." into stable/fraser
  - Replace nova get flavor with shade client.

    Rename get_flavor_by_name with get_flavor.
    Function get_flavor now uses shade client.

    JIRA: YARDSTICK-1088

    Change-Id: Ic82127e475baf39643be0a254b177f3058b85748
    Signed-off-by: Shobhi Jain <shobhi.jain@intel.com>
    (cherry picked from commit 35bbd618b1e69a5b5edbd64a333720bfa5a92400)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index ecade87..e497db0 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit ecade87f9b6b10c2c13ae42d78b82e0792a31ffe
+Subproject commit e497db05d20ca19eeea41887362493eefa60d641