Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "[bugfix] report generate command print error"
  - [bugfix] report generate command print error

    JIRA: YARDSTICK-1056

    Change-Id: I32ab9ae7482f6b81e00d6d3e7e858d980a2dd95f
    Signed-off-by: rexlee8776 <limingjiang@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 9c50ed0..8a82f85 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 9c50ed0e9bdb4dec5a95af40eb0e89ee962fcd40
+Subproject commit 8a82f8527816bbc56af6d37fcfbd82d8271c2f1e