Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Cleanup metrics report

    Change-Id: I79b56d7490930db171fe93e314be4f6d73b0063b
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index c613b3a..b9ac93b 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit c613b3a509f061885304d0b82834c6865cbfe4ce
+Subproject commit b9ac93be6587754b1e7ddc7c6bdafbf1f50fa50c