Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Merge "Replace Qtip with QTIP"
  - Replace Qtip with QTIP

    Change-Id: I7ac76209b10938bb33b5c1879acc343be0bab858
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index b9060bd..ddb7157 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit b9060bdf88bb793e67bd2297d842705c5fdfa510
+Subproject commit ddb71579c10fe3b9c1c10b44fd06f1d7fc0849e3