The trusty apache2 charm fails automated testing

[Matt Bruzek]

In an effort to improve quality, we are testing all charms in an automated process.

According to the latest test results by charm http://reports.vapour.ws/charm-tests-by-charm this charm is failing automated testing.

The automated testing tool runs the `make lint`, `make test` targets, and runs the tests in the tests/ directory. The automated report can be found here:
http://reports.vapour.ws/charm-tests/charm-bundle-test-455-results

According to the report the `make lint` and 'make test' targets fail with errors similar to the precise/apache2 charm.

I have written a simple deployment amulet test that is in the review queue. The amulet tests pass but the `make test` target still fails with the same error. That output can be found here:

http://reports.vapour.ws/charm-tests/charm-bundle-test-10634-results

The `make test` target failure still needs to be addressed. The error output is:

FAIL: tests.test_cert.CertTests.test_is_selfsigned_cert_stale_private_address_changed
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/var/lib/jenkins/workspace/charm-bundle-test/tmpyTrz7b/apache2/.venv/local/lib/python2.7/site-packages/mock.py", line 1201, in patched
    return func(*args, **keywargs)
  File "/var/lib/jenkins/workspace/charm-bundle-test/tmpyTrz7b/apache2/hooks/tests/test_cert.py", line 95, in test_is_selfsigned_cert_stale_private_address_changed
    hooks.is_selfsigned_cert_stale(config, cert_file, key_file))
  File "/var/lib/jenkins/workspace/charm-bundle-test/tmpyTrz7b/apache2/.venv/local/lib/python2.7/site-packages/unittest2/case.py", line 678, in assertTrue
    raise self.failureException(msg)
AssertionError: False is not true