Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Switch from generate_report to PrettyTable

    run_tests.py now relies on PrettyTable as most of the openstack clients.
    generate_report.py and its related unit tests are simply removed.

    It sets padding_width=5 in testcase.py too to conform with
    run_tests.py.

    Now report is printed in every case.

    Change-Id: Id9ce93f984503f25d6a2150482f397853fa3dd64
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 5a9e8f0..8cfa8d1 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 5a9e8f0924daf487c872aab077400df70451813e
+Subproject commit 8cfa8d15a572cbae8bd46dae2a19f9b764684a12