TI API: Rel 0.9.8

[FabrizioMoggio]

What type of PR is this?

Add one of the following kinds:

• enhancement/feature
• cleanup
• documentation

What this PR does / why we need it:

This PR improves the TI API documentation and returned values to help the API Consumer to identify the target of the service data flow (the selected Edge EAS)

Which issue(s) this PR fixes:

• DNS cache: https://github.com/camaraproject/EdgeCloud/issues/293
• Destination EAS IP: https://github.com/camaraproject/EdgeCloud/issues/294
• Documentation improvement: https://github.com/camaraproject/EdgeCloud/issues/309

Changelog input

- Documentation modified to add DNS and better explanation on the tasks from the TI API and API Consumer in order to identify the correct target of the service data flow
- added "selected_appInstanceId" as output parameter in the API Notification