Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Get Ansible to work with bare ubuntu 16.04

    Bare ubuntu 16.04 doesn't have python2.

    [1] https://gist.github.com/gwillem/4ba393dceb55e5ae276a87300f6b8e6f.

    Change-Id: I677fe0b387826b0c94c8a819a6424d3f4e8a3448
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 0e10592..8d1912b 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 0e105924554824f9d08df24678e83e174fef2197
+Subproject commit 8d1912b86d0a31954abdad05198bb2d69e51e8c7