Update git submodules

* Update docs/submodules/qtip from branch 'stable/euphrates'
  - Merge "Freeze requirements for Euphrates" into stable/euphrates
  - Freeze requirements for Euphrates

    Change-Id: Ifbdd773235497373eba8ecc44b21c207441fe407
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>
    (cherry picked from commit 583d7181b15ae6f8d6319c36bad6fd043f47c89f)

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 0afcb90..3d3a0da 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 0afcb901da65e76f42d908633d84a7e408c1d8a0
+Subproject commit 3d3a0daa625c17d20f746c056930a00e6278a2f8