Switched to Ubuntu 14.04 LTS (Trusty) base image
Switched to Ubuntu 14.04 LTS (Trusty) base image

It looks like loop devices works differently with Vivid and it make
sense to use latest LTS release instead.

Closes-Bug: #1483085
Change-Id: If1673ce06646142cd153803a100fe9c2c0f01dfa

Alzon/SUR,annegentle/magnum,dimtruck/magnum,mjbrewer/testindex,eshijia/magnum,ddepaoli3/magnum,ArchiFleKs/magnum,annegentle/magnum,ArchiFleKs/magnum,mjbrewer/testindex,openstack/magnum,Tennyson53/SUR,ddepaoli3/magnum,Alzon/SUR,eshijia/SUR,mjbrewer/testindex,Tennyson53/magnum,dimtruck/magnum,openstack/magnum,Tennyson53/magnum,Tennyson53/SUR,jay-lau/magnum,eshijia/magnum,eshijia/SUR