Update git submodules

* Update docs/submodules/qtip from branch 'stable/euphrates'
  - Storage QPI Userguide

    Add storage QPI userguide.

    JIRA: QTIP-288

    Change-Id: Ie3376345832e54238239a44f0d4e1218dbac82c1
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>
    (cherry picked from commit 8caf5d01a623a3a5c7774e19416e9e6635dc0de5)

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 0a90de8..3f929d9 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 0a90de857e868b06a673e4980e313e34e9170b2b
+Subproject commit 3f929d991ea4ca402aaf4db46752f703771f44ea