Update git submodules

* Update docs/submodules/qtip from branch 'stable/fraser'
  - bugfix fraser compute ci job

    https://build.opnfv.org/ci/view/qtip/job/qtip-compute-fuel-zte-virtual6-fraser/

    Installer type "fuel" should be replaced to "mcp".

    Change-Id: I9ecdfe8e8401532d32846cd94e4d9d06486e20e9
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>
    (cherry picked from commit 094386e88b330cda67cddc881825f7433bb47ea5)

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 2c1f682..873817c 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 2c1f682a9c7216a159f2d6c5b710eaf9bb7ccebe
+Subproject commit 873817cb48cb796bdbc4075299e92488cdee3f0e