Convert deprecated [cluster] config to [coordinator]

cmd/influxd/run/config.go

@@ -140,6 +140,16 @@ func (c *Config) FromToml(input string) error {
 		log.Printf("deprecated config option %s replaced with %s; %s will not be supported in a future release\n", in, out, in)
 		return out
 	})
+
+	// Replace deprecated [cluster] with [coordinator]
+	re = regexp.MustCompile(`(?m)^\s*\[(cluster)\]`)
+	input = re.ReplaceAllStringFunc(input, func(in string) string {
+		in = strings.TrimSpace(in)
+		out := "[coordinator]"
+		log.Printf("deprecated config option %s replaced with %s; %s will not be supported in a future release\n", in, out, in)
+		return out
+	})
+
 	_, err := toml.Decode(input, c)
 	return err
 }

cmd/influxd/run/config_test.go

@@ -252,6 +252,9 @@ bind-address = ":1000"
 
 [opentsdb]
 bind-address = ":2000"
+
+[cluster]
+max-select-point = 100
 `); err != nil {
 		t.Fatal(err)
 	}
@@ -261,5 +264,8 @@ bind-address = ":2000"
 		t.Fatalf("unexpected collectd bind address: %s", c.CollectdInputs[0].BindAddress)
 	} else if c.OpenTSDBInputs[0].BindAddress != ":2000" {
 		t.Fatalf("unexpected opentsdb bind address: %s", c.OpenTSDBInputs[0].BindAddress)
+	} else if c.Coordinator.MaxSelectPointN != 100 {
+		t.Fatalf("unexpected coordinator max select points: %s", c.Coordinator.MaxSelectPointN)
+
 	}
 }