CHANGELOG: Document changes since 0.11.0
CHANGELOG: Document changes since 0.11.0

Through da6d45b3 (Merge pull request #890 from
staebler/asset_loading_tests, 2019-02-04).

Background for the networking.type validation entry is in this thread
[1].

The OpenStack HAProxy entry has wording based on [2] and Russell's
out-of-band suggestions.

Forwarding static-pod longs to systemd is still in flight with [3].

[1]: https://github.com/openshift/installer/pull/1013#discussion_r248009024
[2]: https://github.com/openshift/installer/pull/1185/files#r253714521
[3]: https://github.com/openshift/cluster-bootstrap/pull/11

derekhiggins/installer,derekhiggins/installer