Fixes mix-it/linkit#263 : speakers (of validated talk), staff and sponsor always have a registered ticket for CURRENT conference.
Removed obsolete failing test
Ref mix-it/linkit#263 : no need to wait one day for asynchronous job to register a ticket for validated speaker, do it synchronously.
Merge pull request #265 from clacote/fix/263-ticketingregistered-for-speakers-staff

Validated speakers, staff and current sponsor always should have a registered ticket