Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Bypass APEX-570 when publishing image metadata

    This temporarily fix aims at testing juju_epc vs a non default region
    name [1]. It must be removed as soon as APEX is fixed [2].

    It completes the previous patch which only modified credentials [3].

    [1] https://build.opnfv.org/ci/view/functest/job/functest-apex-baremetal-daily-master/lastFailedBuild/console
    [2] https://jira.opnfv.org/browse/APEX-570
    [3] https://gerrit.opnfv.org/gerrit/#/c/53465/

    Change-Id: I3e1e64ad7147ee5cdf899eb2500f8b825b818619
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>