Refactoring verify_cert

Apply the changes that we've been talking about in
https://github.com/pyca/pyopenssl/pull/155 regarding the placement of
verify_cert, viz., moving verify_cert from top level of crypto into
X509StoreContext.

This makes the pyOpenSSL API slightly different than the OpenSSL API,
but the plan will be to add back a verify_cert to the top level that is
nice to use.
3 files changed