Add etcd to the list of services to validate.

Also add minions.

pkg/tools/fake_etcd_client.go

@@ -50,6 +50,7 @@ type FakeEtcdClient struct {
 	TestIndex   bool
 	ChangeIndex uint64
 	LastSetTTL  uint64
+	Machines    []string
 
 	// Will become valid after Watch is called; tester may write to it. Tester may
 	// also read from it to verify that it's closed after injecting an error.
@@ -83,6 +84,10 @@ func NewFakeEtcdClient(t TestLogger) *FakeEtcdClient {
 	return ret
 }
 
+func (f *FakeEtcdClient) GetCluster() []string {
+	return f.Machines
+}
+
 func (f *FakeEtcdClient) ExpectNotFoundGet(key string) {
 	f.expectNotFoundGetSet[key] = struct{}{}
 }