The two RegistrationBase & Rhsm classes were copied from the ones in the
shared module_utils.redhat module; that said:
- the versions here got improvements over the years
- the RegistrationBase in module_utils.redhat is used only by the RHN
modules, which are deprecated and slated for removal
Hence, the classes here can be kept and simplified a bit:
- fold the non-dummy content of RegistrationBase into Rhsm: there is no
more need for the separate RegistrationBase base class
- drop the init arguments "username", "password", and "token": the
instance variables of them are not used anywhere, as the needed
credentials (together with other variables) are passed to the
register() method
- create the Rhsm object later in main(), after the AnsibleModule
creation and the uid check: this avoids the creation of Rhsm with a
null module variable, changing it later
There should be no behaviour change.
