e/B20autopkgtest: Use autodep8 in autopkgtest hook to check existence of tests

Rafael Laboissièrerequested to merge
rafael/pbuilder:check-autodep8 into master

The hook script B20autopkgtest fails to detect the existence of unit tests for packages that have no debian/tests/control file but that have autodep8 support. This commit fixes the issue.

Closes: #945593

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