Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "ssh: add new get_file_obj method to fetch remote files"
  - ssh: add new get_file_obj method to fetch remote files

    We can either cat remote files, or we can just sftp get
    them.

    use sftp get for /proc/cpuinfo since it can be so very large
    on systems with 88+ cores.

    Change-Id: I420b8c5eefdce8bb3e3b13dcc8257583dee537c1
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>