Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Get node IPs and IDs according to env"
  - Get node IPs and IDs according to env

    Extract node IPs and IDs for each node having a controller or compute
    role (name starting with the "cmp" or "ctl" prefix) and add them into
    the $pod_yaml file, analogous to the previous implementation.
    Since node IDs are expected to be unique and integers (condition that
    does not match the salt node ID format), they are substituted with an
    incremented index for each controller/compute node in the environment.

    Change-Id: Id90626edc3f098bd96343336b2be179721dee5a1
    Signed-off-by: Catalina Focsa <catalina.focsa@enea.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 6ecb9a6..bb581e5 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 6ecb9a6d50345277645633b1bed4d255dc434222
+Subproject commit bb581e5213ec07bd34a749d20adce1d9b9e6666e