update nsb yaml

[ShutingQing]

What type of PR is this?

Add one of the following kinds:

• enhancement/feature : Update nsb initial yaml file. Including create a slice booking session, delete and inquiry session.

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Changelog input

 release-note

Additional documentation

This section can be blank.

docs

[DanXu-ChinaTelecom]

Does SLA Targets need to include maximum delay?