python3-hypothesis: enable ptest

The upstream "fast" tests (tests/cover and tests/pytest) take over
5 minutes to run and do not run cleanly. They also add dependency
on python3-pexpect and python3-ptyprocess (currently in meta-python).

The tests are also not included in the pypi tarball, so it would
require use of git fetcher and other invasive changes to the recipe,
including dropping the pypi inherit.

Instead, use two test suites from examples/

References:
https://github.com/HypothesisWorks/hypothesis/tree/master/hypothesis-python/tests
https://github.com/HypothesisWorks/hypothesis/tree/master/hypothesis-python/examples



Signed-off-by: Tim Orling <timothy.t.orling@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>