test fixes for openshift_certificates_expiry

- create pytest fixtures for building certs at runtime
- update tests to use the fixtures
- add tests for load_and_handle_cert
- fix py2/py3 encode/decode issues raised by tests
- add get_extension_count method to fakeOpenSSLCertificate
- avoid using a temp file for passing ssl certificate to openssl
  subprocess
- other test tweaks:
  - exclude conftest.py and tests from coverage report
  - reduce the fail_under to 26%, since the tests being included were
    inflating our coverage

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