Use Tempest stable library interfaces

Now Ceilometer uses copy&paste tempest code and the gate issue
happened sometimes because the code refers tempest internal code
which is defined as unstable.
This patch makes Ceilomter use the stable library interfaces instead
for keeping the gate test stable.

Change-Id: I055d8482a9be5fc5d4cf2601a31573aec9e4bee6
6 files changed
tree: cf06660e913940ceee9a06e82fe8b320671f9bc0
  1. ceilometer/