Replace single process mini-dfs with multiple processes

This should allow individual service components, such as a single nodemanager,
to be shutdown for failure testing. The mini-cluster bundled with hadoop is a
single process that does not expose the ability to control individual roles.
Now each role can be controlled and configured independently of the others.

Change-Id: Ic1d42e024226c6867e79916464d184fce886d783
Reviewed-on: http://gerrit.ent.cloudera.com:8080/1432
Tested-by: Casey Ching <casey@cloudera.com>
Reviewed-by: Casey Ching <casey@cloudera.com>