Revert "Run unit tests in tripleo-image-elements"
Revert "Run unit tests in tripleo-image-elements"

This reverts commit cdd09d30731678c99b5f20196145899af5cc1b35.

The gate for tripleo-image-elements is broken due to this commit. We
need to fix doc building and python26 before this will pass.

Change-Id: Icf02d05ff1e6f455b65c123a1091d4d32e6dbf1f

open-switch/infra_project-config,noorul/os-project-config,osrg/project-config,citrix-openstack/project-config,dongwenjuan/project-config,anbangr/osci-project-config,Tesora/tesora-project-config,osrg/project-config,openstack-infra/project-config,openstack-infra/project-config,dongwenjuan/project-config,Tesora/tesora-project-config,anbangr/osci-project-config,coolsvap/project-config,coolsvap/project-config,open-switch/infra_project-config,citrix-openstack/project-config,noorul/os-project-config