Implement changes to award models according to new specs
Change terminationReason swagger field description to enum with list of reasons. Specs: public-projects/documentations!193 (merged) public-projects/documentations!194 (merged) public-projects/documentations!197 (merged) public-projects/documentations!198 (merged)
Leave terminationReason swagger field description as string value. Specs: public-projects/documentations!195 (merged) public-projects/documentations!196 (merged)
Root issue: #553 (closed)