[BUG] Security demo certificate is using deprecated setttings

[nathaliellenaa]

What is the bug?
Security demo certificate is using deprecated settings:

• plugins.security.ssl.transport.enforce_hostname_verification instead of transport.ssl.enforce_hostname_verification

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Use security demo certificate
2. Check automatically added configuration in opensearch.yml. See plugins.security.ssl.transport.enforce_hostname_verification: false

What is the expected behavior?
Security demo certificate use the new settings transport.ssl.enforce_hostname_verification

What is your host/environment?
OS 3.3

Do you have any screenshots?
If applicable, add screenshots to help explain your problem.

Do you have any additional context?
Configuration doc: https://docs.opensearch.org/latest/security/configuration/tls/#advanced-hostname-verification-and-dns-lookup

[cwperks]

[Triage] Thank you for filing this issue @nathaliellenaa. This would be good to complete. Please find these settings in the SecuritySettingsConfigurer.