Add server/cache support to gaeconfig.

tokenserver/appengine/certconfig/rpc_import_ca_configs_test.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package certconfig
 
 import (
         "testing"
 
         "golang.org/x/net/context"
 
         ds "github.com/luci/gae/service/datastore"
         "github.com/luci/gae/service/info"
         "github.com/luci/luci-go/appengine/gaetesting"
-        "github.com/luci/luci-go/common/config"
         "github.com/luci/luci-go/common/config/impl/memory"
+        "github.com/luci/luci-go/luci_config/server/cfgclient/backend/testconfig"
 
         "github.com/luci/luci-go/tokenserver/api/admin/v1"
 
         . "github.com/luci/luci-go/common/testing/assertions"
         . "github.com/smartystreets/goconvey/convey"
 )
 
 func TestImportCAConfigsRPC(t *testing.T) {
         Convey("with mock context", t, func() {
                 ctx := gaetesting.TestingContext()
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 PkoYH9WC8tSbqNof3g==
 -----END CERTIFICATE-----
 `
 
-// prepareCfg injects config.Interface implementation with a bunch of
+// prepareCfg injects config.Backend implementation with a bunch of
 // config files.
 func prepareCfg(c context.Context, configFile string) context.Context {
-        return config.SetImplementation(c, memory.New(map[string]memory.ConfigSet{
+        return testconfig.WithCommonClient(c, memory.New(map[string]memory.ConfigSet{
                 "services/" + info.AppID(c): {
                         "tokenserver.cfg":           configFile,
                         "certs/fake.ca.crt":         fakeCACrt,
                         "certs/another-fake.ca.crt": anotherFakeCACrt,
                 },
         }))
 }