Improve Oozie EXT support.

Switch to using nanliu/staging module.
Parameterize the URI of the ext-2.2.zip file.
Allow CM to control the Flume service.
Keep it simple.  Just include mysql::java.
Add repositories to fixtures.yml.
Add some Hive classes.

Ass support for hive metastore, server, server2, and MySQL Java
connecter.
Use safe_autoupgrade.

Use $cloudera::params::safe_autoupgrade.
Sort the parameter order in Class['cloudera::cm::server'].