Convert elastic-recheck to ubuntu-trusty
Convert elastic-recheck to ubuntu-trusty

Change job to use ubuntu-trusty.

Change-Id: I289018d2d056f82f97423dc45ec57beb69a14a59

dongwenjuan/project-config,openstack-infra/project-config,openstack-infra/project-config,noorul/os-project-config,noorul/os-project-config,Tesora/tesora-project-config,Tesora/tesora-project-config,dongwenjuan/project-config