update: Change update notifier for new style banner. (#3289)

For binary releases and operating systems it would be

All operating systems.
```
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Minio is 25 days 12 hours 30 minutes old                           ┃
┃ Update: https://dl.minio.io/server/minio/release/linux-amd64/minio ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
```

On docker.
```
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Minio is 25 days 12 hours 32 minutes old ┃
┃ Update: docker pull minio/minio          ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
```

cmd/humanized-duration_test.go

@@ -0,0 +1,76 @@
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ *
+ * 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 cmd
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+// Test humanized duration.
+func TestHumanizedDuration(t *testing.T) {
+	duration := time.Duration(90487000000000)
+	humanDuration := timeDurationToHumanizedDuration(duration)
+	if !strings.HasSuffix(humanDuration.String(), "seconds") {
+		t.Fatal("Stringer method for humanized duration should have seconds.", humanDuration.String())
+	}
+	if strings.HasSuffix(humanDuration.StringShort(), "seconds") {
+		t.Fatal("StringShorter method for humanized duration should not have seconds.", humanDuration.StringShort())
+	}
+
+	// Test humanized duration for seconds.
+	humanSecDuration := timeDurationToHumanizedDuration(time.Duration(5 * time.Second))
+	expectedHumanSecDuration := humanizedDuration{
+		Seconds: 5,
+	}
+	if humanSecDuration != expectedHumanSecDuration {
+		t.Fatalf("Expected %#v, got %#v incorrect conversion of duration to humanized form",
+			expectedHumanSecDuration, humanSecDuration)
+	}
+	if strings.HasSuffix(humanSecDuration.String(), "days") ||
+		strings.HasSuffix(humanSecDuration.String(), "hours") ||
+		strings.HasSuffix(humanSecDuration.String(), "minutes") {
+		t.Fatal("Stringer method for humanized duration should have only seconds.", humanSecDuration.String())
+	}
+
+	// Test humanized duration for minutes.
+	humanMinDuration := timeDurationToHumanizedDuration(10 * time.Minute)
+	expectedHumanMinDuration := humanizedDuration{
+		Minutes: 10,
+	}
+	if humanMinDuration != expectedHumanMinDuration {
+		t.Fatalf("Expected %#v, got %#v incorrect conversion of duration to humanized form",
+			expectedHumanMinDuration, humanMinDuration)
+	}
+	if strings.HasSuffix(humanMinDuration.String(), "hours") {
+		t.Fatal("Stringer method for humanized duration should have only minutes.", humanMinDuration.String())
+	}
+
+	// Test humanized duration for hours.
+	humanHourDuration := timeDurationToHumanizedDuration(10 * time.Hour)
+	expectedHumanHourDuration := humanizedDuration{
+		Hours: 10,
+	}
+	if humanHourDuration != expectedHumanHourDuration {
+		t.Fatalf("Expected %#v, got %#v incorrect conversion of duration to humanized form",
+			expectedHumanHourDuration, humanHourDuration)
+	}
+	if strings.HasSuffix(humanHourDuration.String(), "days") {
+		t.Fatal("Stringer method for humanized duration should have hours.", humanHourDuration.String())
+	}
+}