Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Leverage cloudify_ims on Cloudify

    It also defines 2 new methods to avoid duplicating code:
      - TenantNetwork1.get_public_auth_url()
      - VmReady1.publish_image_alt()

    Shaker and Tempest are updated as well.

    Change-Id: Ie9095c57c580b95f067d5a8275ad71818b4df335
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 6812e47..8e96ddf 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 6812e47c760a202c920271bcc87b3d183b2f61e1
+Subproject commit 8e96ddfb6a6548a9a7a9b4a686e01378425a1cd8