Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "ansible: add grub.cfg hugepages regexp replace"
  - ansible: add grub.cfg hugepages regexp replace

    when building the image in chroot we can't run
    update-grub of grub-mkconfig because both commands
    probe for root partitions, which doesn't work
    in the chroot.

    Instead we manually regexp replace the kernel boot
    line in /boot/**/grub*.cfg

    Change-Id: I31fac2a3db4d1d044f11357b1715119066509676
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>