Cryptography_HAS_10x_**VERIFICATION**_ERROR_CODES
Move verification errors into x509_vfy

Refs #1140.

Cc @ayrx: it may be a good idea to test this since it touches the
special constant that was secretly added to Fedora 20's OpenSSL 1.0.1e.
Whitespace fix
Move X509_STORE_CTX out of ssl.py

Refs #1140.
Move X509_STORE functions to x509_vfy.py
Comment style consistency
Merge pull request #1151 from lvh/consolidate-x509-vfy

Consolidate x509_vfy