Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Fix the regular expression for refstack"
  - Fix the regular expression for refstack

    Otherwise, this line could not be matched:
    {0} tempest.api.identity.v3.test_tokens.TokensV3Test.test_create_token [0.143237s] ... ok
    -> the matched result: tempest.api.identity.v3.test_t

    Change-Id: I97282a9c98a889a015a40f9ad2d700906bb88fb1
    Signed-off-by: Linda Wang <wangwulin@huawei.com>