[openstack|metering] Added metering service for Ceilometer
[openstack|metering] Allow multiple filtering queries
Merge pull request #1 from alvingarcia/metering

[openstack|metering] Allow multiple filtering queries
[openstack|metering] Fix get_statistics mock
Merge pull request #2 from alvingarcia/openstack-metering

[openstack|metering] Fix get_statistics mock