fixups for rhel-6-openstack backports

Summary of adjustments for sosreport 2.2:
* change classnames to match filenames
* make all classes derive from sos.plugintools.PluginBase
* addCopySpecs is not present in rhel6 sosreport
 (I was testing with sos-2.2-38.el6_4.2.noarch)
* option_enabled -> getOption