Update git submodules

* Update docs/submodules/qtip from branch 'stable/euphrates'
  - Fix bug in ``qtip/scripts/quickstart.sh``

    - line 29: error: command not found

    Change-Id: I0256ae89aaf4938b883cfae72d30f73d43b1da76
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>
    (cherry picked from commit c57f521a767737605d8e739de0e470a96923def0)

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index bd3f02f..595b3be 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit bd3f02f681a8fb2f6ea0fb194fe9cd398bffb61b
+Subproject commit 595b3bedb76988415eae34c693cf2eac99b68b52