Move broker defaults into core (#2947)

config/400-config-br-default-channel.yaml

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+core/configmaps/default-broker-channel.yaml

config/400-config-br-defaults.yaml

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+core/configmaps/default-broker.yaml

config/core/configmaps/default-broker-channel.yaml

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+# Copyright 2020 The Knative Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: config-br-default-channel
+  namespace: knative-eventing
+data:
+  channelTemplateSpec: |
+    apiVersion: messaging.knative.dev/v1alpha1
+    kind: InMemoryChannel

config/core/configmaps/default-broker.yaml

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+# Copyright 2020 The Knative Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: config-br-defaults
+  namespace: knative-eventing
+data:
+  # Configuration for defaulting channels that do not specify CRD implementations.
+  default-br-config: |
+    clusterDefault:
+      brokerClass: ChannelBasedBroker
+      apiVersion: v1
+      kind: ConfigMap
+      name: config-br-default-channel
+      namespace: knative-eventing