Fix incorrect URI of Ceilometer API v2

Ceilometer use meter_name to identify meters, so all URIs for meter
should use meter_name instead of meter_id. If end user uses meter_id
to try to get specific meter, empty set will be returned.

Change-Id: I4a73f5e3fe4f3ee042bafd8cf3f7bbb36c9d1ae8
Closes-Bug: #1273191