Remove tempest.common data_utils

Now most OpenStack projects have switched to use tempest.lib data_utils.
Then we can remove old tempest.common data_utils for the cleanup.

Ref: http://lists.openstack.org/pipermail/openstack-dev/2017-March/113942.html

Change-Id: Iba05bc604f447f2acaf4cd81e05443b366b821a1
2 files changed