Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Merge "Add instructions about branching"
  - Add instructions about branching

    Change-Id: Iecaabe34dcc2eabf520d0b2793edad26b4b0df79
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 0864103..f7f4570 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 08641031dd2ead76e4d29b0a66be5c028076990d
+Subproject commit f7f457081297837a310e55a2442e6577af2e29d7