Rename module from scm to cloudera.
Massive parameterized class effort.

Pull in puppetlabs/stdlib as a dependency.
Added Yumrepo['cloudera-impala'], Class['cloudera::cdh::impala'],
and Class['cloudera::cdh::bigtop'].
Moved manifests/plugins.pp to manifests/cdh/hue/plugins.pp.
Centralize all class parameters so that we can simply invoke "class
{'cloudera': paramter => value }" and all child classes will get their
parameters passed to them.