Fixes (failed in AWS new images + deprecated gflag)

[FranckPachot]

The script failed on new Amazon images with:

warning: use_initial_sys_catalog_snapshot
Invalid port: expected port after ':' at position 0 in :7100
```
The error was: `--rpc_bind_addresses=:7100`
The reason was failure to get the IP from AWS metadata

Fix: Use IMDSv2 to get metadata on AWS
https://aws.amazon.com/about-aws/whats-new/2022/10/amazon-machine-images-support-instance-metadata-service-version-2-default/

Also removed `use_initial_sys_catalog_snapshot` which is deprecated