Save functional testing files after testing done.
Save functional testing files after testing done.

Save functional_creds.conf and functional-tests.log for further debugging.

Closes-Bug: #1516466
Change-Id: Ie4f7697c865596fe0479a3aa6c9ace2f0b12eb3d

dimtruck/magnum,ArchiFleKs/magnum,openstack/magnum,openstack/magnum,jay-lau/magnum,ArchiFleKs/magnum,dimtruck/magnum