PASS/FAIL should be log levels

Instead of:
```
2021-08-26T19:56:22.610+0200	INFO	[PASS] [icmp] https://github.com duration=205
2021-08-26T19:56:22.610+0200	INFO	[FAIL] [icmp] https://google.com duration=5
```

It Should be:
```
2021-08-26T19:56:22.610+0200	PASS [icmp] https://github.com duration=205
2021-08-26T19:56:22.610+0200	FAIL	  [icmp] https://google.com duration=5
```