remove loopback 127.0.0.1 from sys.ip_addresses

It has no discovery value for reporting and configuration.
Sorry to be pedantic here but: tab vs space.
```
576 static void RemoveIPv4LoopbackAddress(Rlist **ips_p)$
577 {$
578   for(Rlist *rp = *ips_p; rp != NULL; rp = rp->next)$
579     {$
580       if(strcmp(RlistScalarValue(rp), "127.0.0.1") == 0)$
581 ^I{$
582 ^I  RlistDestroyEntry(ips_p, rp);$
583 ^I  break;  // unsafe to iterate over modified list$
584 ^I}$
585     }$
586 }$
```

I'm actually a bit surprised github doesn't mark this up...