This patch addresses a bug where ports that had their QoS policy
removed did not have the rules deleted as the agent was restarting
and cleared the internal port info. This results in the policy still
being in effect while it has been cleared from the port qos-policy field.
Change-Id: I2e8e4aa96d2fd15b344220c4bf8a4713197fae4e
Closes-Bug: 1663908