Improve CI (#281)

* 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.

tests/integration/targets/setup_pyopenssl/meta/main.yml

@@ -1,3 +1,4 @@
 dependencies:
+  - setup_python_info
   - setup_remote_constraints
   - setup_pkg_mgr