Update git submodules

* Update docs/submodules/yardstick from branch 'stable/danube'
  - fix multi-monitor unitest hang
    
    need to mock SSH.from_node().execute.return_value
    because we switch most SSH calls to use from_node()
    factory function
    
    Change-Id: Ibea525c2fcc243d41de8ccbcd40bc98532d69006
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    (cherry picked from commit 5271e612d427b29c2da84f8417f4192427ae3977)
    

1 files changed, 0 insertions, 0 deletions

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
-Subproject fc1b6f9e2129fabfebbe0e6ea210f48edc0ff27
+Subproject ad3ff4cbaf92808801c9157d25416da6cff8266