* we don't have these mac builders any more

let's see if we get coverage from azure like we should!

* remove a branch we can't cover in tests

* remove unused import

* test: ensure all public members of ExtensionOID have names defined

* add name for ExtensionOID.PRECERT_POISON

ref: https://github.com/google/certificate-transparency/blob/5fce65cb60cfe7808afc98de23c7dd5ddbfa1509/python/ct/crypto/asn1/oid.py#L338

* fix aia encoding memory leak

* don't return anything from the prealloc func

Using an all 0 key causes failures in OpenSSL master (and Fedora has
cherry-picked the commit that causes it). The change requires that the
key/tweak for XTS mode not be the same value, so let's just use a random
key.

* fix from_issuer_subject_key_identifier to take the right type

deprecate passing the old Extension wrapper object

* don't use a try:except:

* hilarious contortions to satisfy doc8

* test: regression test for UnicodeEncodeError in x509 name in #4810

added utf8 encoding at the top of the file due to PEP 263

* bugfix: #4810 resolve UnicodeEncodeError in x509 name

* fix a memory leak in AIA parsing

* oops can't remove that

* fix != comparison in py2 (fixes #4821)

* remove blank line b/c pep8

* move __ne__ next to __eq__ as per review request