Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Merge "Fix bug in apex inventory"
  - Fix bug in apex inventory

    The default user for overcloud should be heat-admin

    JIRA: QTIP-267
    Change-Id: Ie868b1a925ca0eaa0292bdfb99d0e328e820f8aa
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 1542b92..7cce634 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 1542b9288c494706c93a710382b42b6975592a5c
+Subproject commit 7cce634eea37d7ea25d5c3ae757514333986a8bb