Update git submodules

* Update docs/submodules/auto from branch 'master'
  - Test case for vnf onboarding [WIP]

    JIRA: AUTO-19

    On behalf of Eric Maye to commit his codes.
    Temporarily keep vnf onboarding test case under
    auto/testcase/vnf.

    Change-Id: Ib5f13587e50d32bb0188dceb9aa1497b06ceb0f9
    Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>

diff --git a/docs/submodules/auto b/docs/submodules/auto
index 8a4a37f..99e60dc 160000 (submodule)
--- a/docs/submodules/auto
+++ b/docs/submodules/auto
@@ -1 +1 @@
-Subproject commit 8a4a37faa382003d25a71ea5b6d6dc7f1c63a434
+Subproject commit 99e60dc7820e7dc003036a6e3f34b6bdd1a1f750