Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Adjust timeouts for installing requrements"
  - Adjust timeouts for installing requrements

    The time it takes to install the the requirements is different on the 2 build
    servers we have for aarch64: on build4 it takes ~12min, on pod5 it takes <10min.
    So the timeouts need to be adjusted again to bigger values to cover both servers.

    JIRA: ARMBAND-391

    Change-Id: Idd8f07e6f54d64a6cfaee0753ecd8efd141ff615
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>