chore(*) lower a log statement in global patches from `warn` to `notice`
chore(*) lower a log statement in global patches from `warn` to `notice`

### Summary

On `init_worker` context we had this:

```
ngx.log(ngx.WARN, "executing a blocking 'sleep' (", s, " seconds)")
```

I decided to change it to:
```
ngx.log(ngx.NOTICE, "executing a blocking 'sleep' (", s, " seconds)")
```

This is not unexpected.

Kong/kong,Kong/kong,Kong/kong