Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "ansible: resize VNF image"
  - 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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