sslutil: implement SSLContext class
Python <2.7.9 doesn't have a ssl.SSLContext class. In this patch,
we implement the interface to the class so we can have a unified
code path for all supported versions of Python.
This is similar to the approach that urllib3 takes.
sslutil: store OP_NO_SSL* constants in module scope
An upcoming patch will introduce a global SSLContext type so we
have a single function used to wrap sockets. Prepare for that by
introducing module level constants for disabling SSLv2 and SSLv3.
sslutil: better document state of security/ssl module
Pythons older than 2.7.9 are lacking the modern ssl module
and have horrible security. Let's document this explicitly.
tests: glob py3 line numbers
Since not everyone is running py3.5 and code changes periodically,
avoid pinning line numbers for invalid syntax errors.
tests: update py3.5 output
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