Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Use directly OpenStack project packages"
  - Use directly OpenStack project packages

    It stops cloning via git for the next OpenStack projects:
      - networking-bgpvpn
      - rally
      - tempest
      - kingbird
      - refstack-client

    It should be noted that refstack_client's setup_env is not designed
    to run in Alpine.

    Change-Id: I00d17912cad39a0c872d317317e98a78ca9ded2c
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 333179c..28d74e2 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 333179c16b724465f655de27c3c4dc0af44419f2
+Subproject commit 28d74e22e5e7a252996c1e0cb29ccb21a97fdeb0