Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - Merge "Extended Context class with get_physical_nodes functionality" into stable/fraser
  - Extended Context class with get_physical_nodes functionality

    JIRA: YARDSTICK-1255

    Change-Id: I446d715dc6cf716a4fcbc1b809c1b1d6303071e0
    Signed-off-by: Chornyi, TarasX <tarasx.chornyi@intel.com>
    (cherry picked from commit 595212edf5ccd71af1bf7ef57a8d260fb1ec0c9e)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 931c7d8..eb54a9e 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 931c7d87597fd61f9e300be2637a0bdd485001d9
+Subproject commit eb54a9e65e838e092e5acb5a8bd4119dd2e9f556