Update LBaaS spec to match implemented metrics
Update LBaaS spec to match implemented metrics

* Renamed unit from connections to connection
* fix the table formatting.
* Renamed the meter names for total and active connections
* fix type to guage and cumulative on stats

Change-Id: I40809b03ebf51856567fa88f88599aeaff1f1ca7

openstack/telemetry-specs,openstack/ceilometer-specs