Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Get debug data before cleaning juju_epc

    It could help us to detect the issue when testing Apex (nosdn).
    It should be only printed on exceptions instead but this proposal is
    safer and straightforward.

    Change-Id: I2cccc737e3b3572af72c2653bf32bc02f9ab9077
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index ed3a825..c789cca 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit ed3a825ec90796fe72387b4bd74033a991b2351b
+Subproject commit c789cca4a6e9afefba0c1622d49a181dd35437f7