Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - Generate pod.yaml from current context
    
    We want to generate pod.yaml from Heat contexts so we can
    re-use the context without destroying it.
    
    But we don't have node role information and it doesn't
    make sense in this case, so make the role optional.
    
    Since we changed Heat to use pkey instead of key_filename,
    we can embed the pkey into the pod.yaml, but we have
    to make sure to convert the pkey to string, in case
    it is a RSAKey object
    
    Change-Id: Ibefcfbd8236e68013a704c39964cb870da825da8
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    
  - Add host&targer in scenario['options']['server_name'] support
    
    JIRA: YARDSTICK-810
    
    Currently host, target is in scenario, but as a input, we prefer it in
    scenario['options'].
    So I add support for under scenario['options']['server_name']
    
    If we write host in scenario['options']['server_name'], the host ip info
    will be written in context.
    
    Change-Id: I90df20467ef5da772d22e9f272a2cac250f822e0
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>
    
  - Log each test case status in a task
    
    JIRA: YARDSTICK-785
    
    Currently if one test case failed, we will log error.
    But if one case success, we do not have any tips.
    We need log success when one case success.
    
    Change-Id: I0f41ac55f2569f44b787133e3f2594a5c5547f4a
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>
    
  - ansible: resize VNF image
    
    When compiling Trex, DPDK, collectd and all the SampleVNFs
    we use more than the 2.2GB size of the original Ubuntu cloud image.
    
    Accordingly we need to resize the image.
    
    If we were not inside a docker container we would use virt-resize
    to automatically handle all the cases, but virt-resize launches qemu.
    
    Instead we can use qemu-img to add extra space, then
    luckily we can use parted to resize the partition and finally
    resize2fs to resize the filesystem.
    
    This limits us to only ext3/4 images, but if we need to
    we could add support for other filesystems by checking
    file system type.
    
    Change-Id: Iac84b8e6967af5be64c280a7b1eaaf09f5d6b3aa
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    

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