Split plugin framework into its own package

Signed-off-by: Carlisia <carlisiac@vmware.com>

pkg/plugin/framework/plugin_base_test.go

@@ -0,0 +1,40 @@
+/*
+Copyright 2018, 2019 the Velero contributors.
+
+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
+
+    http://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.
+*/
+package framework
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/heptio/velero/pkg/util/test"
+)
+
+func TestClientLogger(t *testing.T) {
+	base := &pluginBase{}
+	logger := test.NewLogger()
+	f := ClientLogger(logger)
+	f(base)
+	assert.Equal(t, logger, base.clientLogger)
+}
+
+func TestServerLogger(t *testing.T) {
+	base := &pluginBase{}
+	logger := test.NewLogger()
+	f := serverLogger(logger)
+	f(base)
+	assert.Equal(t, newServerMux(logger), base.serverMux)
+}