Fix autopkgtests, using non-deprecated test-suite (Fixes: #960031)

Lukas Märdianrequested to merge
slyon/python-httplib2:slyon/fix-autopkgtests into master

The current test-suite in python3/httplib2test.py is deprecated: https://github.com/httplib2/httplib2/issues/166

Use upstream's currently used test-suite instead into: test/ & tests/, available as of 0.17.4

Edited by Lukas Märdian

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