Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Add Rally scenarios for testing floating IP

    rally_sanity:
      NovaServers.boot_server_associate_and_dissociate_floating_ip

    rally_full:
      NovaServers.boot_server_associate_and_dissociate_floating_ip
      NovaServers.boot_and_associate_floating_ip

    Change-Id: I31b7693828920bae92ff4ac8e7b0fde86e958cb5
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 1ab7a53..6efcc4f 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 1ab7a53dab08a6f67ff2cf54f33b70dea0e82bfb
+Subproject commit 6efcc4fe7456663445e9fbda54bba3239288ad73