Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "task: drain background runner queues"
  - task: drain background runner queues
    
    We were not draining the queues in the background
    runners.
    
    Modify the main runner_join loop to loop over
    all the runners and drain them.
    
    The runner join method does extra work for periodic actions
    so we can't change its behavior.
    
    Instead create a new poll() method and use that
    to check runner status
    
    Change-Id: I9466ba40a6a4c45c82cedff279cbb4817c6b66ad
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    

1 files changed, 0 insertions, 0 deletions

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
-Subproject 9cddcb57326b1108a76744aa41a367648545952
+Subproject 962fb77e5823c8bd399a06f5b26ede7caa35563