Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Move SSH key generation from "init" to "deploy""
  - Move SSH key generation from "init" to "deploy"
    
    In [1], the Context SSH key generation was modified; the SSH now has a
    name matching the name context (which depends on the given name and
    the task ID).
    
    In a test suite, the task ID is the same for all test cases executed
    in the same batch. If the context name of different test cases is the
    same (there is no impediment, e.g.: "demo", "yardstick"), the SSH key
    filename will be the same.
    
    Currently the SSH key generation is done during the initialization
    process, at the begining of the test suite executing. If, by
    coincidence, two test cases have the same context name, the first
    one will remove the SSH key file during the "undeploy" process; then
    the second one will rise an exception because the SSH key file is
    deleted.
    
    This patch moves the SSH key file generation from the initialization
    process to the context deploy process:
    
      TEST SUITE:
        - init: parse all test cases
        - test case 1:
          - deploy (generate SSH keys)
          - run
          - undeploy (delete SSH keys)
        - test case 2: ...
    
    [1] Id175061d6cfe23a068bb3d12ce176c1f176e8236
    
    JIRA: YARDSTICK-1045
    
    Change-Id: I05dc46db20d2a0cba3092c415ce9b248513406fb
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>
    

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