[examples/xss_scanner] replace relative import

test_xss_scanner.py was utterly failing because of a trouble (bug?)
with the `monkeypatch` fixture failing to replace `gethostbyname`
with the correct mock function.

Indeed, when stepping through the code, the `gethostbyname` presumably
mocked was reported as a builtin python function. The problem could
then come from the fact that it is hard to monkeypatch builtin function
in python.

Using absolute imports seems to resolve the problem.

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