Ian Wienand db87a0845f Set default python-path to "auto" ...

The "python-path" configuration option makes its way through to Zuul
where it sets the "ansible_interpreter_path" in the inventory.
Currently this defaults to "/usr/bin/python2" which is wrong for
Python 3-only distributions.

Ansible >=2.8 provides for automated discovery of the interpreter to
avoid runtime errors choosing an invalid interpreter [1].  Using this
should mean that "python-path" doesn't need to be explicitly for any
common case.  As more distributions become Python 3 only, this should
"do the right thing" without further configuration.

This switches the default python-path to "auto".  The dependent change
updates Zuul to accept this and use it when running with Ansible
>=2.8, or default back to "/usr/bin/python2" for earlier Ansible
versions.

Testing and documentation is updated, and a release note added.

[1] https://docs.ansible.com/ansible/2.8/reference_appendices/interpreter_discovery.html

Depends-On: https://review.opendev.org/682275
Change-Id: I02a1a618c8806b150049e91b644ec3c0cb826ba4

2019-10-17 09:17:50 +11:00

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