Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Set plugfest demo site for default testapi url

    Change-Id: I4a77e9f5ccb9c2d60343e9894e175e1f903965a8
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 759410e..59e48a5 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 759410e4d9feafc1cff66a47e21227e55c04b4cb
+Subproject commit 59e48a5df9eb9c10708cd1873f8b5c623bdeb5f2