[test_tools] Add debug attribute to MockWillie.

Ip module uses this and fails if it doesn't exist.
[core] Add ability for example-decorator tot take a list as results.

When multiple lines of responses are expected, they are given as a list to
test_tools.
[test_tools] Add capability to ignore lines of output.

Ip module outputs a notification if it's downloading the location database.
The best way to handle such notifications is to ignore them completely so
I added a way to do that.
[ip] Fix unit test to handle downloading database notification.

If the database isn't already downloaded there is an additional notification
which should be ignored.