Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - Enable multi-port perf in trex as TG

    set TRex -c option for threads per port based on
    hardware number of queues.

    We can't auto-detect number of queues and we can't
    use more than one thread per core on systems with single-queue
    interfaces, so move the option to the config file

    options:
      tg_0:
        queues_per_port: 2

    also enable trex debug by removing >/dev/null redirection

    options:
      tg_0:
        trex_server_debug: true

    Change-Id: I46da187849282bf28f4ef5b333e1ae890e202768
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
  - runners: add timeout to queue put

    we don't want to block the test waiting to put KPIs
    Add moderate timeout.  In case we do timeout, it
    doesn't matter if we drop intermitten KPIs

    Change-Id: I049c785355993e6b286748a5c897d54dd2923dc9
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
  - add collectd resource node capability

    allow manually adding collectd nodes using Node context.

    if a node is present with a collectd config dict then
    we can create a ResourceProfile object for it
    and connect to collectd.

    example

    nodes:
    -
        name: compute_0
        role: Compute
        ip: 1.1.1.1
        user: root
        password: r00t
        collectd:
            interval: 5
            plugins:
                ovs_stats: {}

    Change-Id: Ie0c00fdb58373206071daa1fb13faf175c4313e0
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
  - Optimize Core usage for the sampleVNFs

    Change-Id: I80aa7e796b9ca4c4881c78310860e293a4a75560
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
  - Prox L3FWD 2-port test fix

    JIRA: YARDSTICK-802

    Updated the handle config for l3fwd 2 port test
    The tx and rx descripters is removed as they
    were not there in original DATS config.
    The BM test was dropping packets beacuse of this.

    Change-Id: I40d113267cbb3376a772b5a5aaecf74bea9d06fb
    Signed-off-by: Abhijit Sinha <abhijit.sinha@intel.com>
  - drain runner queue and undo cancel_join_thread

    Sometimes the runners can hang.  Initially
    debugging lead to the queue join thread, so I thought
    we could cancel all the join threads and everything would be okay.

    But it turns out canceling the queue join threads can lead
    to corruption of the queues, so when we go to drain the queues
    the task hangs.

    But it also turns out that we were not properly draining
    the queues in the task process.  We were waiting for all
    the runners to exit, then draining the queues.

    This is bad and will cause the queues to fill up and hang
    and/or drop data or corrupt the queues.

    The proper fix seems to be to draining the queues in a
    loop before calling join with a timeout.

    Also modified the queue drain loops to no block on queue.get()

    Revert "cancel all queue join threads"

    This reverts commit 75c0e3a54b8f6e8fd77c7d9d95decab830159929.

    Revert "duration runner: add teardown and cancel all queue join threads"

    This reverts commit 7eb6abb6931b24e085b139cc3500f4497cdde57d.

    Change-Id: Ic4f8e814cf23615621c1250535967716b425ac18
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
  - exec_tests: remove releng clone code

    we bind-mount the credentials into the container
    so we don't need to clone releng

    Change-Id: I838745a1470015a693f1801c93b930e8df06ef4b
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
  - Ensure that at least one handler is available

    https://jira.opnfv.org/browse/YARDSTICK-773?filter=-3

    Remove dependency of yardstick on utils methods

    Change-Id: Iadf502364a7f08c279a8f0d17d7e45e8047f4066
    Signed-off-by: Edward MacGillivray <edward.s.macgillivray@intel.com>
  - 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>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 1ae94f8..28688e6 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 1ae94f88212a29ae83c927effc2facefb8bee4bd
+Subproject commit 28688e6866cea5b16870864ced9a6d4751094e6f