Michael f6c19896a2 lifecycle logs as Debug instead of Info (#610) ...

The life-cycle messages should not have the same level as the update messages.

Why?
I receive a (mail-) notification for every run even if no image is changed: 
```
2020-07-31 06:44:33 (info): Executing pre-check command.
```

But I only want to receive a notification if something changed:
```
2020-07-20 06:44:44 (info): Found new traefik:v2.2 image (sha256:7c992081f52423e325bd12debf0edcb4f7cfa398683c26f99c00112ec14e1ab9)
```

2020-08-08 18:40:23 +02:00

..

lifecycle.go

lifecycle logs as Debug instead of Info (#610)

2020-08-08 18:40:23 +02:00