Use super() to call base class methods

Such as __init__() and summary().

Signed-off-by: Andy Grover <agrover@redhat.com>
Add tag support

Tags allow initiator WWNs to be given shorter names, as well as multiple
WWNs to be managed as one unit. get() operations just get values from

Simplify auth- and discovery_auth-setting code.


Signed-off-by: Andy Grover <agrover@redhat.com>