Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Replace neutron router interface deletion with shade."
  - Replace neutron router interface deletion with shade.

    Function remove_interface_router now uses shade client instead of neutron
    client.

    JIRA: YARDSTICK-890

    Change-Id: I6bd36e35a339cce64dfa8b69c1e7b56cd70af956
    Signed-off-by: Shobhi Jain <shobhi.jain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index ebd835c..3006bad 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit ebd835c33cc8d0f9124fd2568231c4c069b00661
+Subproject commit 3006badbe2123ae4697c924744656fc13584505e