Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - miss dependencies for ubuntu

    Change-Id: Id97daffbb0ce97ad4248934192f8f574deac7446
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 1a017fa..1928bf7 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 1a017fa4bd32aac493806924e719fb866c8281e9
+Subproject commit 1928bf717f9ccd24a34ff749ab0fcf7c157b50ec