Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - bugfix pip 10.0.0 issue in nettest dockerfile

    Change-Id: Ie879efd662fba803cc5c6156c0981a0054e0f5da
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index d415712..f7ed2f2 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit d415712aeaf87dd6d7383a7649e15a9350aba07b
+Subproject commit f7ed2f20be7c848e3a79aaef2569d01a452bac77