Update git submodules

* Update docs/submodules/qtip from branch 'stable/danube'
  - Merge "Cleanup DEVELOP.md" into stable/danube
  - Cleanup DEVELOP.md

    - remove unecessary content
    - move CLI develop guide to rst document

    Change-Id: I20b6f458aa13f1feb1764e6c4d096ec8a9dddf49
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 7fc754c..f01644b 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 7fc754c98224ba2bc174982c4bb0240d34117183
+Subproject commit f01644b80a940cf17300114db7593c66c6120b54