* 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.
* Improve openssh_* tests.
* Use 2048 instead of 4096 bit keys in many places.
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* Parameterize default RSA key length for tests.
* Reduce default RSA key size to 1024.
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* Fix error.
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* Use variable more often.
* Use 2048 bits for RSA keys for certificates on RHEL8 and CentOS8.
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* Fix missing constant.
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* Print default key sizes.
Felix Fontein