Format code
Use new objects in main
RPMPackage.name -> RPMPackage.get_name()

To indicate that some operation is happening in the background.
Remove non-used function
Get rid of non-usd validation
Test build_map
Remove script entry-point
fix pep8 violations
Add fake helper: map_rpmname_query

This way tests look nicer
Extract make_ramfs()
Mock out getsyspath properly

As the in-memory filesystem raises an exception from getsyspath() method,
replace the method with a fake, that returns SYSPATH:<path>.
get_syspath() -> syspath

It was a function, so that it could be mocked out, but as the in-memory
object has getsyspath, this function no longer needs to be mocked.
move build_map method to RPMSDir
YAGNI: get rid of validate method
Fix pylint violation
Rename non-used import