* Remove monkeypatching of rhn config in rhn_register
rhn_register.Rhn() was doing some complicated monkeypatching of
the up2date_client.config.Config() class to add a default config
value. Since that was only used in one place, remove the monkeypatch
and handle the single default case.
That case was 'server_url' option, so replace it with a Rhn.server_url
property. Also handle the error case when no server url is provided.
* refactoring
* flatten some indention levels
* add 'enable_eus' to module doc
* set enable_eus var and use it directly
* style/pep8/etc cleanups
* some import cleanups
types was unused, os/re were from module_utils * import
* remove * import from module_utils.redhat
* remove * imports from module_utils.base
* remove unused Rhn._subscribe method
* cleanup pep8 style stuff
* remove a unused default mutable arg from Rhn.subscribe
Rhn.subscribe() only gets called in one place, and thats
with channels from module_params which default to [] and
are typed as a list.
b3b598c835