Split openssl.yml into smaller focused files

Summary

roles/strongswan/tasks/openssl.yml is 283 lines handling 5+ responsibilities. Split into focused files for maintainability.

Current State

Single file handling:

• CA certificate generation
• Server certificate generation
• Client certificates
• CRL generation
• p12 file generation

Proposed Structure

roles/strongswan/tasks/
├── openssl.yml              # Main orchestration (import only)
├── openssl_ca.yml           # CA certificate generation (~60 lines)
├── openssl_server.yml       # Server certificate (~40 lines)
├── openssl_clients.yml      # Client certificates (~80 lines)
└── openssl_distribution.yml # p12 and CRL generation (~60 lines)

Benefits

• Each file has single responsibility
• Easier to test individual components
• Easier to understand and maintain
• Reduces cognitive load when debugging certificate issues