Change counter to sample vocable in cm.transformer

This changes counter to sample vocable in ceilometer.transformer code

Parts of the blueprint remove-counter

Change-Id: I81b840299f25425f5d43a2aef6272927eadd6cda
Remove no more used code in test_notifier

This change remove no more used code in test_notifier

Parts of the blueprint remove-counter

Change-Id: I4fab2f9c30a08aa1e84dec8a59f16cbb9349b3ae