[Startup] Log output change
[Startup] Network startup fixes

- Take the fallback IP down as soon as we start configuring the network
- Shorten the time we wait for DHCP IPs to ~10 seconds.
- Bring up the fallback IP after waiting for a valid DHCP IP
- Auto detect whether we should use 192.168.0.0/24 or 192.168.1.0/24.
  This code still needs enhancing to do better network detection.
- Don't bring up the fallback route if we have a valid wlan0 gateway
- Don't down eth0 just because the link is down.