Swith auth_uri to use v2.0
Swith auth_uri to use v2.0

When using admin creds in periodic task, the auth_uri is not correct.

Partial-Implements: blueprint add-periodic-task
Change-Id: I9febdc5831c8ab1c684268fa0d7b64f23b7ba238

Tennyson53/SUR,Alzon/SUR,mjbrewer/testindex,annegentle/magnum,openstack/magnum,Tennyson53/magnum,eshijia/magnum,ArchiFleKs/magnum,paulczar/magnum,LaynePeng/magnum,ChengTiesheng/magnum,mjbrewer/testindex,eshijia/SUR,annegentle/magnum,eshijia/magnum,hongbin/magnum,mjbrewer/testindex,eshijia/SUR,LaynePeng/magnum,paulczar/magnum,Alzon/SUR,ramielrowe/magnum,sajuptpm/magnum,ChengTiesheng/magnum,dimtruck/magnum,dimtruck/magnum,ffantast/magnum,ArchiFleKs/magnum,ramielrowe/magnum,ffantast/magnum,openstack/magnum,ddepaoli3/magnum,Tennyson53/magnum,ddepaoli3/magnum,jay-lau/magnum,hongbin/magnum,sajuptpm/magnum,Tennyson53/SUR