Alias cleanup
Alias cleanup

Add alias property to MappedLUN, and use it.

Simplify control flow in _get_alias()

Eliminate code in LUN._get_storage_object by using self.alias

Signed-off-by: Andy Grover <b7d524d2f5cc5aebadb6b92b08d3ab26911cde33@redhat.com>

mikenawrocki/rtslib-fb,mikenawrocki/rtslib-fb,cvubrugier/rtslib-fb,agrover/rtslib-fb