Refactor actions that are needed to be taken during port status changes.

For any change in port status, the following needs to be done:
1. Send port changed Broadcast
2. Log to statsd
3. Update contaminant notification.

Bug: 128534822
Test: Tested with the mock circuit.
Change-Id: I2c279a2ea0255a69c0a74a98ebf5bf680cae1fe1