Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Unify workdir

    - use role variable `workdir`
    - download dependencies to remote workdir with checksum

    Change-Id: I2a7991e014e365fec532520c2b57a3fe480914d8
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index b9ac93b..e579659 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit b9ac93be6587754b1e7ddc7c6bdafbf1f50fa50c
+Subproject commit e579659699b4571a69990efc5861914e4701a4f6