CHANGELOG: Document changes since 0.15.0

[wking]

Through 58a2767 (Merge pull request #1497 from vrutkovs/upi-multistage-cli, 2019-03-29).

The base commit is from:

$ oc image info $(oc adm release info --image-for=installer quay.io/openshift-release-dev/ocp-release:4.0.0-0.9) | grep commit.url
             io.openshift.build.commit.url=https://github.com/openshift/installer/commit/58a27678c02d28693306e1ff5ff8480d7c9fb84c

I've also rebuilt the asset-graph SVG.

[abhinavdahiya]

/lgtm

It's concerning that,
58a2767 is 4 days old.

while operator like mco which is tightly coupled to the installer is only 1 day old:

$ oc adm release info  quay.io/openshift-release-dev/ocp-release:4.0.0-0.9 --commits | rg machine-config-controller
  machine-config-controller                     https://github.com/openshift/machine-config-operator                       ee4e0643716780def1aadaaf7ef4f67b2f99cd7f

$ git --no-pager show ee4e0643716780def1aadaaf7ef4f67b2f99cd7f
commit ee4e0643716780def1aadaaf7ef4f67b2f99cd7f
Merge: 6d351e1 feca590
Author: OpenShift Merge Robot <[email protected]>
Date:   Mon Apr 1 09:07:15 2019 -0700

    Merge pull request #592 from JAORMX/info-log-level

    ContainerRuntimeConfig: Enable "info" debug level

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhinavdahiya, wking

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[wking]

e2e-aws:

Flaky tests:

[Feature:DeploymentConfig] deploymentconfigs with revision history limits [Conformance] should never persist more old deployments than acceptable after being observed by the controller [Suite:openshift/conformance/parallel/minimal]

Failing tests:

[k8s.io] Kubelet when scheduling a busybox Pod with hostAliases should write entries to /etc/hosts [NodeConformance] [Conformance] [Suite:openshift/conformance/parallel/minimal] [Suite:k8s]
[sig-storage] In-tree Volumes [Driver: aws] [Testpattern: Dynamic PV (block volmode)] volumeMode should create sc, pod, pv, and pvc, read/write to the pv, and delete all created resources [Suite:openshift/conformance/parallel] [Suite:k8s]
[sig-storage] In-tree Volumes [Driver: nfs] [Testpattern: Pre-provisioned PV (block volmode)] volumeMode should fail to create pod by failing to mount volume [Suite:openshift/conformance/parallel] [Suite:k8s]

Those were mitigated by openshift/origin#22454 and openshift/origin#22455 until we get a new machine-os-content with an OSTree built with the new, 1.13 kubelet.

/retest

[wking]

e2e-aws:

aws_s3_bucket.ignition: NoSuchBucket: The specified bucket does not exist

/retest