Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - samplevnf: fix make_ip_addr

    we get TypeError sometimes, so
    we need to catch them

    Change-Id: I5fc58006f18acf84f62d8f4a21077d71b2fb0ed8
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 255ae5b..e07484e 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 255ae5b1e6e85f118ef42298bfbc8dce1ad1969f
+Subproject commit e07484ef707af89c12ebf3e9ed4490d9ff588750