New registration flow included in all test plan

doc/testing/testplan/README.md

doc/testing/testplan/api_access_control_policy/README.md

doc/testing/testplan/api_auditing_service/README.md

doc/testing/testplan/api_discover_service/README.md

doc/testing/testplan/api_events_service/README.md

doc/testing/testplan/api_invoker_management/README.md

...estplan/api_invoker_management/invoker_register_body.json

doc/testing/testplan/api_logging_service/README.md

doc/testing/testplan/api_provider_management/README.md

...tplan/api_provider_management/provider_register_body.json

doc/testing/testplan/api_publish_service/README.md

doc/testing/testplan/api_security_service/README.md

doc/testing/testplan/common_operations/README.md

...common_operations/user_getauth_response_body_example.json

...ng/testplan/common_operations/user_registration_body.json