Switch to use stable data_utils

Tempest provides stable library interfaces under tempest.lib.
This patch switches to use it for data_utils.

Change-Id: I44b2773d92413b8a51d14f8c96042f2cf7db076b
3 files changed
tree: c91916e8e7f3ee2ef10b743266942defd7a78750
  1. ceilometer/