* Install PyOpenSSL and cryptography from PyPi if target Python != system Python.
* Work around some CentOS6, 7, Ubuntu 16.04 problems. Improve jinja2 compatibility handling.
* Skip tasks that require properties that aren't always there.
* Only install OpenSSL when not present.
* Improve output.
* Improve get_certificate integration test graceful failing.
* Fix tests.
* Fix assert.
* OpenSSL peculiarities.
* Fix condition.