Remove fix for tripleo/+bug/1351491.
Remove fix for tripleo/+bug/1351491.

It seems like the 'python setup.py --version' is now working correctly for
the affected projected. Moreover the mitigation is no longer valid since
the last tag for tripleo-image-elements is icehouse-eol.

tripleo-heat-templates$ python setup.py --version
6.0.0.0b3.dev336

tripleo-image-elements$ python setup.py --version
6.0.0.0b3.dev16

diskimage-builder$ python setup.py --version
1.26.2.dev43

Change-Id: I27858f16a08817682ba45e9b29e6ec0283498afc

openstack-packages/DLRN,openstack-packages/DLRN,openstack-packages/delorean,openstack-packages/delorean