Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Add missing link for euphrates release notes

    Change-Id: Icc0067e961c497f203996eafedec3e316ea6e5ff
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 795221c..4daf798 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 795221ce0cbd9daf23af9f3099e29c947bcad306
+Subproject commit 4daf79855c2dccff22134939245497140343bfa3