Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "add collectd ansible"
  - add collectd ansible

    required DPDK fixes to enable building collectd with dpdkstats
    need /usr/lib/dpdk-pmd symlinks

    Compiling all this code requies more space than the default ubuntu
    cloud-image, so we need to resize the cloud image somehow

    Change-Id: Ib39fc94ba8101ca1aebc7d2a710be88b0338f7c3
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    Signed-off-by: Maciej Skrocki <maciej.skrocki@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 24becc7..12722dc 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 24becc79e0abecaaa24aa018ecac4476738e0a66
+Subproject commit 12722dca61e657942182b236ca0281aabee47b96