Sponsor request fulfilled

https://osraav.atlassian.net/browse/OSRA-87

Implement request_fulfilled field in sponsor:-
- create migration
- added field in index, show, edit 
- field not show in create
- model validations implemented

OSRA-87 OSRA-88 OSRA89 OSRA-90 #code-review

I have fixed white space issues.
I think brevity wins out here so have put the reload in expect as suggested