Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Configure the param auth_version in tempest.conf"
  - Configure the param auth_version in tempest.conf

    1. If the auth_url is "https://192.168.31.222:443/identity-admin/v3", the
       auth_version in tempest.conf is supposed to be "v3", not "id".
    2. For rally 0.8.1. it is a bug when obtaining the auth_version, please see
       [1], which has been fixed in rally master.

    [1]: https://review.openstack.org/#/c/468599/

    Change-Id: Ia7474938a741a0954f17f7c7650544dbc0a28853
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index dc7f851..a48bf0c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit dc7f851b0c5412709b52396b0855c0572c904525
+Subproject commit a48bf0c8306e566f15877f3bd72882cf8b7663db