fix: Use the right kind of public cloud loadbalancer

[amstuta]

Description

• cloud loadbalancer commands update to manipulate Octavia loadbalancers
• add a cloud reference loadbalancer list-flavors command

Fixes #55 (issue)

Type of change

• New feature (non-breaking change which adds functionality)
• Improvement (improvement of existing commands)

Checklist:

• My code follows the style guidelines of this project
• I have commented my code
• I updated the documentation by running make doc
• I ran go mod tidy
• I have added tests that prove my fix is effective or that my feature works