Update git submodules

* Update docs/submodules/qtip from branch 'stable/danube'
  - Freeze dependency versions

    Change-Id: I9106c31eb7786c3fc98d9e53bd9626349431de4e
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index ff9766e..f92c2a7 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit ff9766e66749513e754acfa8af8d74356be99d78
+Subproject commit f92c2a77455c356d48046fad7c3056e193dd5a0c