Fixes#7228
Add some changes to make Talos accept partial machine configuration
without main v1alpha1 config.
With this change, it's possible to connect a machine already running
with machine configuration (v1alpha1), the following patch will connect
to a local SideroLink endpoint:
```yaml
apiVersion: v1alpha1
kind: SideroLinkConfig
apiUrl: grpc://172.20.0.1:4000/?jointoken=foo
---
apiVersion: v1alpha1
kind: KmsgLogConfig
name: apiSink
url: tcp://[fdae:41e4:649b:9303::1]:4001/
---
apiVersion: v1alpha1
kind: EventSinkConfig
endpoint: "[fdae:41e4:649b:9303::1]:8080"
```
Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>
That PR contains an example of how fuzz tests can be written with Go 1.18.
It also fixes a few panics with invalid configs.
Signed-off-by: Alexey Palazhchenko <alexey.palazhchenko@talos-systems.com>
