Drop Flume support.
Rename scm_agent and scm_server classes.
Install flume-ng as part of cloudera::cdh.
Stupid vim tried to be helpful.

Removed octothorpes from db.properties.erb.
Refacter cloudera::cm::server.

Drop the use of multiple booleans to determine DB type and instead use
one enumerated variable.
Add validation and standard $ensure/$autoupgrade/$service_ensure
boilerplate.