Do not use absolute path in data_files
Do not use absolute path in data_files

More useful discussion is found at [1] and its thread.

[1] http://lists.openstack.org/pipermail/openstack-dev/2016-June/097123.html

Change-Id: I468dd72477fbb69583291a04a3a7b18e581945d6

openstack/networking-nec,openstack/networking-nec,stackforge/networking-nec,stackforge/networking-nec