Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - test_create_keypair: fix op_utils mock and mock paramiko

    Change-Id: I5c039c0d4f4ba651209c7d5ca4e748f9151b5630
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index c19115b..cc3c8c7 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit c19115bafe0141326b189f317a684bf4681c8bd0
+Subproject commit cc3c8c7971c6a610f2cd30d505a916c3fa29a910