Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Update rally_conf.json for creating deployment"
  - Update rally_conf.json for creating deployment

    1. The rally_conf.json is obtained via def get_credentials_for_rally(),
       where the parameter endpoint_type is supposed to get from the env
       OS_ENDPOINT_TYPE or OS_INTERFACE, just as the def
       get_creds_from_env_vars() in rally project [1].

    [1] https://github.com/openstack/rally/blob/master/rally/cli/envutils.py

    JIRA: FUNCTEST-801

    Change-Id: I6b6be82b9ff7f04948b47c4fca836d415fe13f8b
    Signed-off-by: Linda Wang <wangwulin@huawei.com>