Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Merge "delete useless dependency coverage"
  - delete useless dependency coverage

    the coverage is counted by pytest-cov

    Change-Id: I156b500e767bde680c46b27f6c05cc89e7e06105
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 6fec5a5..d635f6d 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 6fec5a5cc7fbaf115c59ac5b3b3f3fabfe940e4c
+Subproject commit d635f6dd96a6cc82ae8380b308eb75eb7d1a7186