Rename openstack-metering to openstack-telemetry

update cookbook name, role name, attributes and related things

Change-Id: I8c8855579fd88746c447b9dda189e93f644584b2
Remove monitoring user from documentation

Recent commit e3db2693b50d9d950adc6119135403eb235335ab created the
'ceilometer' user. A 'monitoring' user is left over and being created
but it isn't being used. This patch removes a reference to it in the
documentation.

Change-Id: I503b7e3d2d6484126f8e798a36fb47f6f717e17a
Adding update to Havana.

CHANGELOG did not have a entry for bump to Havana. Also standardized the
contents of the CHANGELOG with that of other repositories.

Closes-Bug: #1270223
Change-Id: I149a8661310f1912c99b18e27c62db8f69d7f9db