Improve nfs module by parameterizing classes and refactor all module.

Add to nodes.pp the necessary includes for what worker01 shared de
directory /data01/hadoop/nn_mirror and master01 mount that directory on
/data01/hadoop/nn_mirror.

Created on /hadoop/manifests/init.pp two class, one for share the
mentioned directory and other for mount the mentioned directory.

Remove puppet:///modules/nfs/files/etc/exports becouse that file its
manage now from puppet.