Convert -tarball jobs to use ubuntu-trusty
Convert -tarball jobs to use ubuntu-trusty

Change -tarball and -branch-tarball jobs to run on ubuntu-trusty.

Change-Id: I9628b62b4054b2e2dc2cc9b27ad0003cd0ca5cef

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