Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Fix rally db issue"
  - Fix rally db issue

    Also update "rally-manage db" to "rally db"

    Change-Id: I0c9924b9869135d3492dfafe89d085813290f565
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 45ad772..e627ff2 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 45ad7723d0e40e7c5475584fc2a5bc0b5ad3ef56
+Subproject commit e627ff2e267c1c59461571d23b89b21199e49737