Fix cloud shotover metrics

[rukai]

I needed to fix two things to get shotover_metrics working on cloud benches:

• Use the connect_ip to fetch the metrics from instead of the private ip. connect_ip will automatically select the private or public ip depending on how aws-throwaway was configured. Public is used when the bencher is on your local machine private is used when the bencher is within EC2.
• expose port 9001 to the internet via expose_ports_to_internet builder method.