Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - KVMFORNFV: To avoid livemigration result update to json

    This patch is used to remove the livemigration testcase result loaded
    to json as there is no dashboard implemented for the testcase

    Change-Id: I7a9589a0bbc5f2a28587c2878da042fc50af18e0
    Signed-off-by: Navya Bathula <navyax.bathula@intel.com>
    (cherry picked from commit 5a1f65d3e7d67488ee6f558dccfa5ca5581ddb65)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 33c4ec6..c5bbc35 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 33c4ec6a7bb4abd30aeb3294950a57b70ac7bc6e
+Subproject commit c5bbc35193afa7a5265c6a00e8d245cb9486ca48