Bypass APEX-570 when publishing image metadata

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>